move generated stubs to separate directory, too messty

django-stubs-generated/db/migrations/topological_sort.pyi

@@ -0,0 +1,11 @@
+from typing import Any, Dict, Iterator, List, Optional, Set
+
+from django.db.migrations.operations.base import Operation
+
+
+def topological_sort_as_sets(
+    dependency_graph: Dict[Operation, Set[Operation]]
+) -> Iterator[Set[Operation]]: ...
+def stable_topological_sort(
+    l: List[Operation], dependency_graph: Dict[Operation, Set[Operation]]
+) -> List[Operation]: ...