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/handler/server/tool.rs

@@ -431,6 +431,7 @@ impl<S> ToolBox<S> {
 }
 
 #[cfg(feature = "macros")]
+#[cfg_attr(docsrs, doc(cfg(feature = "macros")))]
 #[macro_export]
 macro_rules! tool_box {
     (@pin_add $callee: ident, $attr: expr, $f: expr) => {