Add possibility to include router via string

handlers.py

@@ -0,0 +1,13 @@
+from typing import Any
+
+from aiogram import Router
+from aiogram.api.methods import SendMessage
+from aiogram.dispatcher.handler.message import MessageHandler
+
+router = Router()
+
+
+@router.message_handler(commands=["test"])
+class MyHandler(MessageHandler):
+    async def handle(self) -> Any:
+        return SendMessage(chat_id=self.chat.id, text="<b>PASS</b>")