Move session into an extractor minus client listener changes.

src/client.rs

@@ -325,7 +325,8 @@ impl Client {
             msg.get_data("doc").unwrap().to_string(),
         )s
         */
-        self.registry.send(&tx_id, initial_msg.reply(MsgType::Document));
+        self.registry
+            .send(&tx_id, initial_msg.reply(MsgType::Document));
     }
 }