How to manage dependencies

[mielvds]

Currently, we list dependencies in

• setup.py is for package distribution,
• requirements.txt for rapid development environment, and
• requirements-test.txt for rapid test development environment

This issue is to discuss whether the last two should be merged for simplicity and/or we should move to something like https://python-poetry.org/

[ioggstream]

For py3.12+ I'm moving projects to pyproject.toml + uv, but in older environment, the old setup is more robust.