Add peewee playhouse.flask_utils stubs (#11731)

Co-authored-by: Avasam <samuel.06@hotmail.com>
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>

stubs/peewee/playhouse/flask_utils.pyi

@@ -0,0 +1,28 @@
+from _typeshed import Unused
+from collections.abc import Container
+from typing import Any
+from typing_extensions import TypeAlias
+
+from peewee import Database, ModelBase, Proxy
+
+# Is actually flask.Flask
+_Flask: TypeAlias = Any
+
+class FlaskDB:
+    # Omitting undocumented base_model_class on purpose, use FlaskDB.Model instead
+    database: Database | Proxy
+    def __init__(
+        self,
+        app: _Flask | None = None,
+        database: Database | Proxy | None = None,
+        # Is actually type[ModelClass] but stubtest likely confuses with Model property
+        # https://github.com/python/typeshed/pull/11731#issuecomment-2067694259
+        model_class=...,
+        excluded_routes: Container[str] | None = None,
+    ) -> None: ...
+    def init_app(self, app: _Flask) -> None: ...
+    def get_model_class(self) -> type[ModelBase]: ...
+    @property
+    def Model(self) -> type[ModelBase]: ...
+    def connect_db(self) -> None: ...
+    def close_db(self, exc: Unused) -> None: ...