Disable monkeypatches, add dependencies via new hook (#60)

* code cleanups, disable monkeypatches, move to add_additional_deps

* disable incremental mode for tests

* add pip-wheel-metadata

* move some code from get_base_hook to get_attribute_hook to reduce dependencies

* simplify values/values_list tests and code

* disable cache for some tests failing with incremental mode

* enable incremental mode for tests typechecking

* pin mypy version

* fix tests

* lint

* fix internal crashes

mypy_django_plugin/transformers/fields.py

@@ -149,7 +149,7 @@ def record_field_properties_into_outer_model_class(ctx: FunctionContext) -> None
     if field_name is None:
         return
 
-    fields_metadata = outer_model.metadata.setdefault('django', {}).setdefault('fields', {})
+    fields_metadata = helpers.get_fields_metadata(outer_model)
 
     # primary key
     is_primary_key = False