Add a CODEOWNERS file

[brandonvin]

Add a CODEOWNERS file, mostly in order to automatically request reviews on PRs.

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 94.62%. Comparing base (6089a3e) to head (7edf759). :warning: Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   94.62%   94.62%           
=======================================
  Files           8        8           
  Lines         614      614           
  Branches       13       13           
=======================================
  Hits          581      581           
  Misses         20       20           
  Partials       13       13           

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