Add new packages catagory for mypy typing stubs and configure some mypy settings in setup.cfg

src/setup.cfg

@@ -20,3 +20,15 @@ omit =
   paperless/workers.py
 	paperless/wsgi.py
 	paperless/auth.py
+
+[mypy]
+plugins = mypy_django_plugin.main, mypy_drf_plugin.main, numpy.typing.mypy_plugin
+check_untyped_defs = true
+disallow_any_generics = true
+disallow_incomplete_defs = true
+disallow_untyped_defs = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+
+[mypy.plugins.django-stubs]
+django_settings_module = "paperless.settings"