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 (9a3b0dd) 11.66% compared to head (61f91a1) 11.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   11.66%   11.66%           
=======================================
  Files           2        2           
  Lines         180      180           
  Branches       27       27           
=======================================
  Hits           21       21           
  Misses        135      135           
  Partials       24       24           

Flag	Coverage Δ
unittests	11.66% <ø> (ø)

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