Added MatrixBot.run() for dev simplification

src/mab/bot/bot.py

@@ -1,3 +1,4 @@
+import asyncio
 import logging
 
 from typing import Callable, Coroutine, Any
@@ -97,6 +98,20 @@ class MatrixBot:
         """
         await self._client_manager.stop()
 
+    async def run(self) -> None:
+        """
+        Start bot operation in foreground. You may cancel task running this
+        method to stop the bot.
+
+        Warning: calling `stop()` is not a supported way to stop the bot. You
+        should cancel this task instead.
+        """
+        await self.start()
+        try:
+            await asyncio.Event().wait()
+        finally:
+            await self.stop()
+
     def get_client(self) -> AsyncClient:
         """
         Get AsyncClient.