improve wrappers, allow clone features of FaceRecognizerSF, more doc

[rainyl]

• 95

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.35%. Comparing base (daf98e8) to head (476a3ae). Report is 2 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== - Coverage 90.46% 90.35% -0.12% ========================================== Files 35 35 Lines 5320 5327 +7 ========================================== Hits 4813 4813 - Misses 507 514 +7 ```

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