Migrate to pyproject.toml, fix cChardet build issue

[Shrinks99]

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Fixes #27

While migrating my own Python install fully to UV tonight, I was unable to get warcit installed due to the issue documented in #27. Figured I'd have a go at fixing it while taking the time to understand authoring a pyproject file. UV isn't required to build warcit with these changes, but it sure is helpful for managing python versions & environments!

This also means that developers will be able to install warcit in editable mode!

Tested with uv run warcit -V & uv build

Changes

• Moves all of setup.py to a modern pyproject.toml file
  • Keeps a minimal setup.py file around for backwards compatibility
• Switches to the faust-cchardet fork
  • Up for debate if this is the best strategy? Could alternatively only support up to Python 3.9 and wait for the original to get updated.
• Sets a requires-python value of >=3.10
• Creates a pylock.toml lockfile
• Bumps the version up by 0.0.1
• Sets a pyyaml loader in test_warcit.py (required as of V6)

Todo

• [x] Ensure tests run as expected with pytest
• [ ] Update readme with new UV development instructions?