Modernize repo

[leplatrem]

• Replaced setup.cfg and setup.py by pyproject.toml
• Replaced flake8 by ruff
• Use requirements.in instead of list in setup.py
• Replaced manually created requirements.txt by pip-compile
• Remove dev-requirements.txt file and use extra dependencies instead
• Use version from git tag (setuptools-scm)
• Publish to Pypi on git tag
• Add config to categorize changes in autogenerated changelog
• Add Github actions to dependabot
• Update release instructions
• Rename master to main
• Replace tox with GH actions
• Move tests out of package
• Move package to src
• Force labels on pull-requests (for better changelog)

Things lost with this PR:

• No more changelog (now on GH releases)
• Description on Pypi does not contain changelog anymore

[alexcottner]

FAIL Required test coverage of 100% not reached. Total coverage: 99.00%\

IMO, striving for a 100% code coverage metric makes us focus on the wrong things. As long as our business logic is covered (which should be >80% in projects that aren't just all IO), I'm happy.

[alexcottner]

nit: It always feels like I should have another function when my if has more than one thought in it. ex:

if args.which == "dump"
  doDump(...)
elif args.which == "load"
  doLoad(...)

[leplatrem]

+1

This is a bit out of scope, the project probably has a lot more to refactor and polish

[alexcottner]

Looks good, we just need to fix the CI checks