Validate-pyproject

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* Added support PEP 735, 208
* Added support PEP 639, 210
* Renamed ``testing`` extra to ``test``, 212
* General updates in CI setup

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- ``setuptools`` plugin:
* Update ``setuptools.schema.json``, 206

Maintenance and Minor Changes
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- Fix misplaced comments on ``formats.py``, 184
- Adopt ``--import-mode=importlib`` for pytest to prevent errors with ``importlib.metadata``, 203
- Update CI configs, 195 202, 204, 205

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- Relax requirements about module names to also allow dash characters, 164
- Migrate metadata to ``pyproject.toml`` , 192

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- Allow overwriting schemas referring to the same ``tool``, 175

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- Update version regex according to latest packaging version, 153
- Remove duplicate `` ruff: noqa``, 158
- Remove invalid top-of-the-file `` type: ignore`` statement, 159
- Align ``tool.setuptools.dynamic.optional-dependencies`` with ``project.optional-dependencies``, 170
- Bump min Python version to 3.8, 167

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- Fix setuptools ``readme`` field , 116
- Fix ``oneOf <> anyOf`` in setuptools schema, 117
- Add previously omitted type keywords for string values, 117
- Add schema validator check, 118
- Add ``SchemaStore`` conversion script, 119
- Allow tool(s) to be specified via URL (added CLI option: ``--tool``), 121
- Support ``uint`` formats (as used by Ruff's schema), 128
- Allow schemas to be loaded from ``SchemaStore`` (added CLI option: ``--store``), 133