Move packaging to pyproject.toml with version from git tags

[salkinium]

Finally doing what the main branch started in 2024 and then forgot about, lol. This moves the packaging to pyproject.toml, takes the version from git tags and publishes to PyPI when a v* tag is pushed, same as modm-data does it. No more "Increase version" commits!

• pyproject.toml with setuptools-git-versioning, same dependencies and entry point as before.
• pypi.yml workflow replaces deloy.yml and uses trusted publishing instead of the PYPI_PASSWORD secret.
• lbuild.__version__ stays a plain X.Y.Z, since modm's repo.lb feeds it into StrictVersion, which chokes on 1.23.0.post1+git.abcdef12. lbuild --version prints the full thing.
• Wheel content is identical to the setup.py one, plus resources/catalog.xml which was missing before, whoops.
• Unit tests pass from the checkout and against the installed sdist.
• lbuild discover on modm works with the built wheel.

Missing:

• There are no git tags in this repo at all, so an untagged build is version 0.0.1. Needs a v1.23.0 tag after merging.
• Trusted publisher for the pypi.yml workflow and pypi environment needs to be configured on PyPI and GitHub.

Running lbuild from a checkout without installing it now reports version 0.0.0, which modm's minimum version check rejects, so use pip install -e . instead.