Convert to modern Python packaging config

[bd808]

Replace setuptools with hatchling or something similar.

[bd808]

• https://packaging.python.org/en/latest/tutorials/packaging-projects/
• https://gitlab.wikimedia.org/toolforge-repos/python-toolforge/-/commit/54f82c54c89e6e49cfdec59f74eb351e591d51de