rename typing.py to custom_types.py for clarity

libp2p/custom_types.py

@@ -0,0 +1,15 @@
+from collections.abc import (
+    Awaitable,
+)
+from typing import (
+    TYPE_CHECKING,
+    Callable,
+    NewType,
+)
+
+if TYPE_CHECKING:
+    from libp2p.network.stream.net_stream_interface import INetStream  # noqa: F401
+    from libp2p.stream_muxer.abc import IMuxedStream  # noqa: F401
+
+TProtocol = NewType("TProtocol", str)
+StreamHandlerFn = Callable[["INetStream"], Awaitable[None]]