clippy all codes (#1214)

1. clippy code
2. add fmt and clippy check in ci

easytier/src/proto/rpc_impl/service_registry.rs

@@ -52,6 +52,12 @@ pub struct ServiceRegistry {
     table: DashMap<ServiceKey, ServiceEntry>,
 }
 
+impl Default for ServiceRegistry {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ServiceRegistry {
     pub fn new() -> Self {
         Self {