Add cross-platform testing

[somewhatabstract]

Summary:

This adds testing for macos and windows so that we can feel more sure that things work how we want. It's possible tests fail on windows. We will need to update the tests to be more cross-platform friendly once we see what those failures are.

Issue: XXX-XXXX

Test plan:

Putting up the draft PR to see what the windows failures are. Once we know what those are, we can update the tests to be more cross-platform friendly and then we should be able to merge this in.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6628e67) to head (357d050).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          155       155           
  Branches        48        48           
=========================================
  Hits           155       155           

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