Add release workflow, dynamic versioning

[sritchie]

This PR:

• replaces the static version with a dynamic versioning plugin that assigns versions based on git sha
• adds a release.yml that will publish to pypi when a new GitHub release is published

Once we merge this we should create a git tag for 0.2.0 at the sha where that version was bumped.

[gabegrand]

Should this be rebased on #29?

[sritchie]

@gabegrand this is ready to go now — I'll do a squash-merge once you give it a 👍 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.00%. Comparing base (632acb6) to head (684a847).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   66.00%   66.00%           
=======================================
  Files          17       17           
  Lines         709      709           
=======================================
  Hits          468      468           
  Misses        241      241           

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