chore: add codeowner file to be consistent with the rest of openfeature

[aepfli]

All the other sdks use codeowner files to ensure proper approvals, we should also utilize this within python-sdk

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.85%. Comparing base (1ae9fc2) to head (92086b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #477   +/-   ##
=======================================
  Coverage   97.85%   97.85%           
=======================================
  Files          37       37           
  Lines        1723     1723           
=======================================
  Hits         1686     1686           
  Misses         37       37           

Flag	Coverage Δ
unittests	97.85% <ø> (ø)

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