Django-dans-api-toolkit

- Added support for Djando 3.1+

- Simplify `requirements.txt`
- Added `requirements-dev.txt` as well
- Added MyPy type checking CI step
- General CI clean up
- Linting improved
- Improved `README.md`

- Fix weird error fields handling
- Will use field errors if no 'better error message'
- TESTS!!!
- Added tests for all major components including:
- `BaseSerializer`
- `ApiResponse`
- `ApiResponseHandler`
- `ApiResponseRenderer`
- CI improvements and test coverage vastly improved
- Almost 100% test coverage!!!
- Updated package requirements
- Django 5.0 support
- Remove support for Python 3.8/9
- Improved API logging

- Typing added!
- Removed `.pyi` files

- Added `pytyped` file to `setup.cfg`

- Added `pytyped` file marker