TcpConnection add getSocket method

Workerman/Connection/TcpConnection.php

@@ -397,6 +397,15 @@ class TcpConnection extends ConnectionInterface
            $this->destroy();
         }
     }
+    
+    /**
+     * get socket
+     * @return resource
+     */
+    public function getSocket()
+    {
+        return $this->_socket;
+    }
 
     /**
      * destroy the connection