drop async-service dep and copy relevant code into a local async_service

tool, updated for modern handling of ExceptionGroup

libp2p/tools/async_service/typing.py

@@ -0,0 +1,16 @@
+# Copied from https://github.com/ethereum/async-service
+
+from types import (
+    TracebackType,
+)
+from typing import (
+    Any,
+    Awaitable,
+    Callable,
+    Tuple,
+    Type,
+)
+
+EXC_INFO = Tuple[Type[BaseException], BaseException, TracebackType]
+
+AsyncFn = Callable[..., Awaitable[Any]]