Migrate to pyproject.toml, fix cChardet build issue

[Shrinks99]

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, and uv tool install -e .

Changes

• Moves all of setup.py to a modern pyproject.toml file
• 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)
• Removes old CI
• Updates a test case where utf-8 was previously incorrectly detected as windows-1258 now that faust-cchardet is used.

Todo

• Ensure tests run as expected with pytest
• Update readme with new UV development instructions

[Shrinks99]

@ikreymer This should be ready to go :)