chore: Use GNU GPLv3 license

[skarllot]

Pull Request

Details on the issue fix or feature implementation

• Use GNU General Public License v3.0 to not allow closed source.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.53%. Comparing base (5ff6a06) to head (e4f028d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   56.53%   56.53%           
=======================================
  Files          72       72           
  Lines        1569     1569           
  Branches      118      118           
=======================================
  Hits          887      887           
  Misses        666      666           
  Partials       16       16           

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