🐛 Fix: 新增 Lifespan._on_ready() 供适配器使用 (#2483)

Co-authored-by: Ju4tCode <42488585+yanyongyu@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

nonebot/internal/adapter/adapter.py

@@ -3,6 +3,7 @@ from contextlib import asynccontextmanager
 from typing import Any, Dict, AsyncGenerator
 
 from nonebot.config import Config
+from nonebot.internal.driver._lifespan import LIFESPAN_FUNC
 from nonebot.internal.driver import (
     Driver,
     Request,
@@ -97,6 +98,9 @@ class Adapter(abc.ABC):
         async with self.driver.websocket(setup) as ws:
             yield ws
 
+    def on_ready(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
+        return self.driver._lifespan.on_ready(func)
+
     @abc.abstractmethod
     async def _call_api(self, bot: Bot, api: str, **data: Any) -> Any:
         """`Adapter` 实际调用 api 的逻辑实现函数，实现该方法以调用 api。