move generated stubs to separate directory, too messty

django-stubs/db/migrations/writer.pyi

@@ -1,41 +0,0 @@
-from typing import Any, Optional, Set, Tuple, Type
-
-from django.db.migrations.migration import Migration
-from django.db.migrations.operations.base import Operation
-
-
-class SettingsReference(str):
-    def __new__(
-        self: Type[SettingsReference], value: str, setting_name: str
-    ) -> SettingsReference: ...
-    setting_name: str = ...
-    def __init__(self, value: str, setting_name: str) -> None: ...
-
-class OperationWriter:
-    operation: django.db.migrations.operations.models.CreateModel = ...
-    buff: List[Any] = ...
-    indentation: int = ...
-    def __init__(
-        self, operation: Operation, indentation: int = ...
-    ) -> None: ...
-    def serialize(self) -> Tuple[str, Set[str]]: ...
-    def indent(self) -> None: ...
-    def unindent(self) -> None: ...
-    def feed(self, line: str) -> None: ...
-    def render(self) -> str: ...
-
-class MigrationWriter:
-    migration: django.db.migrations.migration.Migration = ...
-    needs_manual_porting: bool = ...
-    def __init__(self, migration: Migration) -> None: ...
-    def as_string(self) -> str: ...
-    @property
-    def basedir(self) -> str: ...
-    @property
-    def filename(self) -> str: ...
-    @property
-    def path(self) -> str: ...
-    @classmethod
-    def serialize(cls, value: Any) -> Tuple[str, Set[str]]: ...
-
-MIGRATION_TEMPLATE: str