Add UAttributesBuilder Documentation and Fix up-core-api build

Builder was missing documentation and was not building notifications correctly, as well the up-core-api being picked up needed to be on the 1.5.7 tag and not latest on main.

.gitmodules

@@ -1,3 +1,4 @@
 [submodule "up-core-api"]
 	path = up-core-api
 	url = https://github.com/eclipse-uprotocol/up-core-api.git
+	tag = uprotocol-core-api-1.5.7

include/up-cpp/transport/builder/UAttributesBuilder.h

@@ -34,6 +34,10 @@
 
 namespace uprotocol::utransport {
 
+/**
+ * UAttributesBuilder is a builder class for UAttributes.
+ * The class provides a fluent interface to build UAttributes objects with the desired attributes.
+ */
 class UAttributesBuilder {
     private:
         uprotocol::v1::UAttributes attributes_;
@@ -43,6 +47,15 @@ class UAttributesBuilder {
             attributes_.Clear();
         }
 
+        /**
+         * Constructor for UAttributesBuilder.
+         * The constructor initializes the UAttributes object with the required attributes that 
+         * MUST be present for all instances.
+         * @param source The source URI of the message.
+         * @param id The unique identifier of the message.
+         * @param type The type of the message.
+         * @param priority The priority of the message.
+         */
         UAttributesBuilder(uprotocol::v1::UUri source,
                            const uprotocol::v1::UUID& id, 
                            uprotocol::v1::UMessageType type, 
@@ -55,85 +68,168 @@ class UAttributesBuilder {
             attributes_.set_priority(priority);
         }
 
+        /**
+         * Set the token attribute of the UAttributes object.
+         * @param token The token to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setToken(const std::string& token) {
 
             attributes_.set_token(token);
             return *this;
         }
 
+        /**
+         * Set the id attribute of the UAttributes object.
+         * @param id The id to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setId(const uprotocol::v1::UUID& id) {
 
             attributes_.mutable_id()->CopyFrom(id);
             return *this;
         }
 
+        /**
+         * Set the source attribute of the UAttributes object.
+         * @param source The source URI to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setSource(const uprotocol::v1::UUri& source) {
 
             attributes_.mutable_source()->CopyFrom(source);
             return *this;
         }
 
+        /**
+         * Set the sink attribute of the UAttributes object.
+         * @param sink The sink URI to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setSink(const uprotocol::v1::UUri& sink) {
 
             attributes_.mutable_sink()->CopyFrom(sink);
             return *this;
         }
 
+        /**
+         * Set the reqid attribute of the UAttributes object.
+         * @param reqid The reqid to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setReqid(const uprotocol::v1::UUID& reqid) {
 
             attributes_.mutable_reqid()->CopyFrom(reqid);
             return *this;
         }
 
+        /**
+         * Set the type attribute of the UAttributes object.
+         * @param type The type to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setType(uprotocol::v1::UMessageType type) {
             attributes_.set_type(type);
             return *this;
         }
 
+        /**
+         * Set the priority attribute of the UAttributes object.
+         * @param priority The priority to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setPriority(uprotocol::v1::UPriority priority) {
             attributes_.set_priority(priority);
             return *this;
         }
 
+        /**
+         * Set the ttl attribute of the UAttributes object.
+         * @param ttl The ttl to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setTTL(int32_t ttl) {
             attributes_.set_ttl(ttl);
             return *this;
         }
 
+        /**
+         * Set the permission_level attribute of the UAttributes object.
+         * @param permission_level The permission_level to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setPermissionLevel(int32_t permission_level) {
             attributes_.set_permission_level(permission_level);
             return *this;
         }
 
+        /**
+         * Set the commstatus attribute of the UAttributes object.
+         * @param commstatus The commstatus to set.
+         * @return A reference to the UAttributesBuilder object.
+         */
         UAttributesBuilder& setCommstatus(uprotocol::v1::UCode commstatus) {
             attributes_.set_commstatus(commstatus);
             return *this;
         }
 
+        /**
+         * Build the UAttributes object with the attributes that are set.
+         * @return The UAttributes object with the set attributes.
+         */
         uprotocol::v1::UAttributes build() const {
             return attributes_;
         }
 
+        /**
+         * Static factory method that builds a publish message with the given source and priority.
+         * @param source The source URI of the message.
+         * @param priority The priority of the message.
+         * @return A new UAttributesBuilder instance.
+         */
         static UAttributesBuilder publish(const uprotocol::v1::UUri& source, uprotocol::v1::UPriority priority) {
             auto uuid = uprotocol::uuid::Uuidv8Factory::create();
             UAttributesBuilder inst(source, uuid, uprotocol::v1::UMessageType::UMESSAGE_TYPE_PUBLISH, priority);
             return inst;
         }
 
+        /**
+         * Static factory method that builds a notification message with the given source, sink, and priority.
+         * @param source The source URI of the message.
+         * @param sink The sink URI of the message.
+         * @param priority The priority of the message.
+         * @return A new UAttributesBuilder instance.
+         */
         static UAttributesBuilder notification(const uprotocol::v1::UUri& source, const uprotocol::v1::UUri& sink, uprotocol::v1::UPriority priority) {
             auto uuid = uprotocol::uuid::Uuidv8Factory::create();
-            UAttributesBuilder inst(source, uuid, uprotocol::v1::UMessageType::UMESSAGE_TYPE_PUBLISH, priority);
+            UAttributesBuilder inst(source, uuid, uprotocol::v1::UMessageType::UMESSAGE_TYPE_NOTIFICATION, priority);
             inst.setSink(sink);
             return inst;
         }
 
+        /**
+         * Static factory method that builds a request message with the given source, sink, priority, and ttl.
+         * @param source The source URI of the message.
+         * @param sink The sink URI of the message.
+         * @param priority The priority of the message.
+         * @param ttl The time-to-live of the message.
+         * @return A new UAttributesBuilder instance.
+         */
         static UAttributesBuilder request(const uprotocol::v1::UUri& source, const uprotocol::v1::UUri& sink, uprotocol::v1::UPriority priority, int32_t ttl) {
             auto uuid = uprotocol::uuid::Uuidv8Factory::create();
             UAttributesBuilder inst(source, uuid, uprotocol::v1::UMessageType::UMESSAGE_TYPE_REQUEST, priority);
             inst.setSink(sink).setTTL(ttl);
             return inst;
         }
 
+        /**
+         * Static factory method that builds a response message with the given source, sink, priority, and uuid.
+         * @param source The source URI of the message.
+         * @param sink The sink URI of the message.
+         * @param priority The priority of the message.
+         * @param uuid The unique identifier of the message.
+         * @return A new UAttributesBuilder instance.
+         */
         static UAttributesBuilder response(const uprotocol::v1::UUri& source, const uprotocol::v1::UUri& sink, uprotocol::v1::UPriority priority, const uprotocol::v1::UUID& uuid) {
             UAttributesBuilder inst(source, uuid, uprotocol::v1::UMessageType::UMESSAGE_TYPE_RESPONSE, priority);
             inst.setSink(sink);