chore: automatically derive version

[flying-sheep]

The version pushed to PyPI is 0.0.1, since the version metadata on the main branch (and the 0.2.0 tag) is static (version = "0.0.1")

This PR switches to hatch-vcs which simply derives the version from the Git tag, i.e. when you create the next release, the tag name you define will be the version.

alternatives

you could manage the version metadata manually and update it before a release

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.88%. Comparing base (3353b9a) to head (c9e2db0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   13.88%   13.88%           
=======================================
  Files          66       66           
  Lines        3593     3593           
=======================================
  Hits          499      499           
  Misses       3094     3094           

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