Thread-safe FaceDetectionTranslator

[StefanOltmann]

In my application, I employed the FaceDetectionTranslator, but encountered an issue with its lack of thread safety. When attempting to process multiple images simultaneously, EngineErrors occurred. After investigation, I identified the root cause as being related to the variables for width and height.

Fortunately, the TranslatorContext's capacity to carry attachments makes resolving this issue relatively straightforward.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.23%. Comparing base (93123ad) to head (133e592).

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3016      +/-   ##
============================================
- Coverage     72.31%   72.23%   -0.08%     
+ Complexity     7290     7287       -3     
============================================
  Files           722      722              
  Lines         32496    32496              
  Branches       3390     3390              
============================================
- Hits          23498    23473      -25     
- Misses         7380     7408      +28     
+ Partials       1618     1615       -3     

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