create monkeypatching function for adding get_item dunder (#526)

* run black

* create monkeypatching function for adding get_item dunder

* whoops i forgot the test

* change the name in INSTALLED_APPS to make test pass

* turn the whole thing into a proper package

* move django_stubs_ext to requirements.txt

* also install requirements.txt

* attempt to fix pre-commit

* numerous small code review fixes

* fix dependency issues

* small dependency fixes

* configure proper license file location

* add the rest of the monkeypatching

* use strict mypy

* update contributing with a note monkeypatching generics

* copy release script from parent package

.pre-commit-config.yaml

@@ -35,5 +35,12 @@ repos:
         entry: mypy
         language: system
         types: [ python ]
-        exclude: "scripts/*"
+        exclude: "scripts/|django_stubs_ext/"
         args: [ "--cache-dir=/dev/null", "--no-incremental" ]
+      - id: mypy
+        name: mypy (django_stubs_ext)
+        entry: mypy
+        language: system
+        types: [ python ]
+        files: "django_stubs_ext/|django_stubs_ext/tests/"
+        args: [ "--cache-dir=/dev/null", "--no-incremental", "--strict" ]