refactor: Transport trait and worker transport, and streamable http client with those new features. (#167)

* refactor: a transport trait and streamable http client

* test: test with js streamable http server

* refactor: separate sse stream connection

* fix(test): streamable http client test with js

* fix(test): wait longer time for js server startup

crates/rmcp/src/model.rs

@@ -36,6 +36,7 @@ pub fn object(value: serde_json::Value) -> JsonObject {
 
 /// Use this macro just like [`serde_json::json!`]
 #[cfg(feature = "macros")]
+#[cfg_attr(docsrs, doc(cfg(feature = "macros")))]
 #[macro_export]
 macro_rules! object {
     ({$($tt:tt)*}) => {