feat: Enable users to customize the host and port for local resolver (#80)

Enable users to customize the host and port to connect to a local resolver

Author: mfranberg

src/main/java/com/spotify/confidence/ConfidenceFeatureProvider.java

@@ -50,9 +50,9 @@ public class ConfidenceFeatureProvider implements FeatureProvider {
    * ConfidenceFeatureProvider constructor
    *
    * @param clientSecret generated from Confidence
-   * @param managedChannel for testing
+   * @param managedChannel gRPC channel
    */
-  ConfidenceFeatureProvider(String clientSecret, ManagedChannel managedChannel) {
+  public ConfidenceFeatureProvider(String clientSecret, ManagedChannel managedChannel) {
     this.clientSecret = clientSecret;
     this.managedChannel = managedChannel;
     this.stub = FlagResolverServiceGrpc.newBlockingStub(managedChannel);
@@ -79,6 +79,18 @@ public ConfidenceFeatureProvider(String clientSecret) {
     this(clientSecret, ManagedChannelBuilder.forAddress("edge-grpc.spotify.com", 443).build());
   }
 
+  /**
+   * ConfidenceFeatureProvider constructor that allows you to override the default gRPC host and
+   * port, used for local resolver.
+   *
+   * @param clientSecret generated from Confidence
+   * @param host gRPC host you want to connect to.
+   * @param port port of the gRPC host that you want to use.
+   */
+  public ConfidenceFeatureProvider(String clientSecret, String host, int port) {
+    this(clientSecret, ManagedChannelBuilder.forAddress(host, port).build());
+  }
+
   @Override
   public Metadata getMetadata() {
     return () -> "com.spotify.confidence.flags.resolver.v1.FlagResolverService";