Add pyproject.toml with wheel as build-time dependency

[WardBrian]

This should hopefully resolve the issues in CI.

A lot of other metadata could be moved into pyproject.toml (package name, author, etc), but I went for the minimal change here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec7feec) 69.72% compared to head (7dcaf60) 69.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   69.72%   69.72%           
=======================================
  Files          19       19           
  Lines        1460     1460           
  Branches      328      328           
=======================================
  Hits         1018     1018           
  Misses        348      348           
  Partials       94       94           

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[billbrod]

Thanks Brian! I'm going to merge this in and then make a new branch for moving over the metadata, so I'm not messing around on your fork.