move generated stubs to separate directory, too messty

django-stubs-generated/contrib/messages/storage/session.pyi

@@ -0,0 +1,20 @@
+from typing import Any, List, Optional, Union
+
+from django.contrib.messages.storage.base import BaseStorage, Message
+from django.http.request import HttpRequest
+
+
+class SessionStorage(BaseStorage):
+    added_new: bool
+    request: django.core.handlers.wsgi.WSGIRequest
+    used: bool
+    session_key: str = ...
+    def __init__(
+        self, request: HttpRequest, *args: Any, **kwargs: Any
+    ) -> None: ...
+    def serialize_messages(
+        self, messages: Union[List[Message], List[str]]
+    ) -> str: ...
+    def deserialize_messages(
+        self, data: Optional[Union[List[Any], str]]
+    ) -> Optional[Union[List[Message], List[str]]]: ...