feat: add subscription management and graceful shutdown support (v0.3.6)

- Add SubscriptionHandle for managing stream lifecycle
- Implement graceful shutdown with stop() methods
- Update documentation with new features
- Bump version to 0.3.6

src/main.rs

@@ -130,6 +130,16 @@ async fn test_grpc() -> Result<(), Box<dyn std::error::Error>> {
     )
     .await?;
 
+    // 支持 stop 方法，测试代码 -  异步1000秒之后停止
+    let grpc_clone = grpc.clone();
+    tokio::spawn(async move {
+        tokio::time::sleep(std::time::Duration::from_secs(1000)).await;
+        grpc_clone.stop().await;
+    });
+
+    println!("Waiting for Ctrl+C to stop...");
+    tokio::signal::ctrl_c().await?;
+
     Ok(())
 }
 
@@ -163,6 +173,16 @@ async fn test_shreds() -> Result<(), Box<dyn std::error::Error>> {
     println!("Listening for events, press Ctrl+C to stop...");
     shred_stream.shredstream_subscribe(protocols, None, event_type_filter, callback).await?;
 
+    // 支持 stop 方法，测试代码 - 异步1000秒之后停止
+    let shred_clone = shred_stream.clone();
+    tokio::spawn(async move {
+        tokio::time::sleep(std::time::Duration::from_secs(1000)).await;
+        shred_clone.stop().await;
+    });
+
+    println!("Waiting for Ctrl+C to stop...");
+    tokio::signal::ctrl_c().await?;
+
     Ok(())
 }