chore(ci): add fossa workflow

[thomasrockhu-codecov]

This PR adds in a FOSSA workflow that ensures that our third-party dependencies have usable licenses.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (972851f) 82.50% compared to head (2137a8f) 82.50%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage   82.50%   82.50%           
=======================================
  Files           1        1           
  Lines          40       40           
=======================================
  Hits           33       33           
  Misses          7        7           

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