Model-bakery

Added
- [dev] Test coverage report

Changed
- Improved performance of `Baker.get_fields()`
- [dev] Cleanup Sphinx documentation config
- [dev] Update `pre-commit` config
- [dev] CI: remove hard requirement on linters for tests to run

Added
- Add Python 3.12 support

Changed
- Revert erroneous optimisation of related logic (fix 439)
- [dev] Bring tox back

Removed

Added
- forward "_create_files" flag to child generators for relational fields

Changed
- Small improvements to `recipe.py::_mapping`
- Improvements to `baker.py::bulk_create`
- [dev] Replaced `pycodestyle`, `pydocstyle`, `flake8` and `isort` with `ruff`
- [dev] Drop tox in favor of using GitHub Actions matrix

Removed
- Drop `baker.py::is_iterator`
- Drop Python 3.7 support (reached end of life)

Added
- Add support for global seeding to baker random generation

Added
- Add support for CharField with max_length=None

Changed
- Fix utils.seq with start=0

Added
- Add psycopg3 support for Django 4.2