refactor: provide http server as tower service (#228)

* refactor: streamable http server as tower service

examples/servers/src/counter_hyper_streamable_http.rs

@@ -0,0 +1,35 @@
+mod common;
+use common::counter::Counter;
+use hyper_util::{
+    rt::{TokioExecutor, TokioIo},
+    server::conn::auto::Builder,
+    service::TowerToHyperService,
+};
+use rmcp::transport::streamable_http_server::{
+    StreamableHttpService, session::local::LocalSessionManager,
+};
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let service = TowerToHyperService::new(StreamableHttpService::new(
+        Counter::new,
+        LocalSessionManager::default().into(),
+        Default::default(),
+    ));
+    let listener = tokio::net::TcpListener::bind("[::1]:8080").await?;
+    loop {
+        let io = tokio::select! {
+            _ = tokio::signal::ctrl_c() => break,
+            accept = listener.accept() => {
+                TokioIo::new(accept?.0)
+            }
+        };
+        let service = service.clone();
+        tokio::spawn(async move {
+            let _result = Builder::new(TokioExecutor::default())
+                .serve_connection(io, service)
+                .await;
+        });
+    }
+    Ok(())
+}