Typing: mypy fixes for

* __main__.py
 * app.py
 * models.py
 * plus.py
 * stats.py

In addition a new module was introduced: types
There all TypedDicts are included. Bitte geben Sie eine Commit-Beschreibung für Ihre Änderungen ein. Zeilen,

frigate/http.py

@@ -141,7 +141,7 @@ def set_retain(id):
 
 @bp.route("/events/<id>/plus", methods=("POST",))
 def send_to_plus(id):
-    if current_app.plus_api is None:
+    if current_app.plus_api.is_active():
         return make_response(
             jsonify(
                 {