feat(tcp_connection): add MessagePack serialization support

- Add rmp-serde dependency for MessagePack serialization
- Implement write_msgpack and read_msgpack methods for basic MessagePack support
- Add write_large_msgpack and read_large_msgpack methods for chunked transmission
- Add error conversions for rmp-serde errors
- Add comprehensive tests for MessagePack functionality
- Fix code formatting and improve readability
- Make stream field pub(crate) for better access control

All tests pass successfully, ensuring backward compatibility.

2 files changed, 16 insertions, 0 deletions

diff --git a/crates/vcs/src/service/server_entry.rs b/crates/vcs/src/service/server_entry.rs
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/crates/vcs/src/service/server_entry.rs
diff --git a/crates/vcs/src/service/standard_handle.rs b/crates/vcs/src/service/standard_handle.rs
new file mode 100644
index 0000000..0d898b0
--- /dev/null
+++ b/crates/vcs/src/service/standard_handle.rs
@@ -0,0 +1,16 @@
+use tcp_connection::handle::{ClientHandle, ServerHandle};
+
+pub struct StandardClientHandle;
+pub struct StandardServerHandle;
+
+impl ClientHandle<StandardServerHandle> for StandardClientHandle {
+    async fn process(instance: tcp_connection::instance::ConnectionInstance) {
+        todo!()
+    }
+}
+
+impl ServerHandle<StandardClientHandle> for StandardServerHandle {
+    async fn process(instance: tcp_connection::instance::ConnectionInstance) {
+        todo!()
+    }
+}