Model-bakery

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

Changed
- Enforce Python 3.7 as a minimum version in project metadata

Removed
- dropped support for `FloatRangeField` as it was removed in Django 3.1
- [dev] Temporary drop Django 4.2 to package classifiers (waiting for build backend support)

Changed
- [dev] Test Python 3.11 with Django 4.2
- [dev] Add Django 4.2 to package classifiers