Fix typing (add pydantic mypy plugin, add type)

django_utils_lib/lazy.py

@@ -1,3 +1,6 @@
+from typing import Callable, Optional
+
+
 class LazyDjango:
     """
     Django has a few modules where if you import something from them,
@@ -9,6 +12,8 @@ class LazyDjango:
     to just use lazy-imports.
     """
 
+    _redirect_to_login: Optional[Callable] = None
+
     @property
     def redirect_to_login(self):
         if self._redirect_to_login is None:

mypy.ini

@@ -5,3 +5,6 @@ ignore_missing_imports = True
 check_untyped_defs = True
 warn_unused_configs = True
 warn_incomplete_stub = True
+
+# == Plugins ==
+plugins = pydantic.mypy