Reshuffled ES types #30

It's very much unfinished.

* split ES types in stm_shared into separate mods
* made ES search generic over <T>
* added simple_error crate to create Lambda errors
* copies ES from html_ui into GQL UI crate

stm_graphql/Cargo.toml

@@ -13,6 +13,7 @@ tracing-subscriber = "0.3"
 log = "0.4"
 lambda_runtime = { git = "https://github.com/awslabs/aws-lambda-rust-runtime.git" }
 lambda-debug-proxy-client = {git = "https://github.com/rimutaka/lambda-debug-proxy.git"}
+simple-error = "0.2"
 hyper = { version = "0.14", features = ["http2"] }
 hyper-rustls = "0.23"
 regex = "1.5"

stm_graphql/src/config.rs

@@ -63,13 +63,13 @@ const SEARCH_TERM_REGEX: &str = r#"[#:\-._+0-9a-zA-Z]+"#;
 const NO_SQL_STRING_INVALIDATION_REGEX: &str = r#"[^#\-._+0-9a-zA-Z]"#;
 
 impl Config {
-    // /// The maximum number of dev listings per page of search results
-    // pub const MAX_DEV_LISTINGS_PER_SEARCH_RESULT: usize = 50;
+    /// The maximum number of dev listings per page of search results
+    pub const MAX_DEV_LISTINGS_PER_SEARCH_RESULT: usize = 50;
 
-    // /// The maximum number of pages allowed in search.
-    // /// Check HTML templates if changing the limits on page numbers
-    // /// 20 is hardcoded in some of the logic there
-    // pub const MAX_PAGES_PER_SEARCH_RESULT: usize = 20;
+    /// The maximum number of pages allowed in search.
+    /// Check HTML templates if changing the limits on page numbers
+    /// 20 is hardcoded in some of the logic there
+    pub const MAX_PAGES_PER_SEARCH_RESULT: usize = 20;
 
     pub fn new() -> Self {
         let aws_region = AwsRegion::from_str(