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 (f2c754b) 72.72% compared to head (1650932) 72.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   72.72%   72.72%           
=======================================
  Files           1        1           
  Lines          11       11           
=======================================
  Hits            8        8           
  Misses          2        2           
  Partials        1        1           

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