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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