move generated stubs to separate directory, too messty

django-stubs-generated/contrib/sessions/backends/signed_cookies.pyi

@@ -0,0 +1,18 @@
+from datetime import datetime
+from typing import Any, Dict, Optional, Union
+
+from django.contrib.sessions.backends.base import SessionBase
+
+
+class SessionStore(SessionBase):
+    accessed: bool
+    serializer: Type[django.core.signing.JSONSerializer]
+    def load(self) -> Dict[str, Union[datetime, str]]: ...
+    modified: bool = ...
+    def create(self) -> None: ...
+    def save(self, must_create: bool = ...) -> None: ...
+    def exists(self, session_key: Optional[str] = ...) -> bool: ...
+    def delete(self, session_key: Optional[str] = ...) -> None: ...
+    def cycle_key(self) -> None: ...
+    @classmethod
+    def clear_expired(cls) -> None: ...