style: fmt the project (#54)

add rustfmt.toml

Signed-off-by: jokemanfire <hu.dingyang@zte.com.cn>

examples/transport/src/unix_socket.rs

@@ -1,6 +1,7 @@
+use std::fs;
+
 use common::calculator::Calculator;
 use rmcp::{serve_client, serve_server};
-use std::fs;
 use tokio::net::{UnixListener, UnixStream};
 
 mod common;