[Sync] Sync with doctr custom orientation model loading

[felixdittrich92]

This PR:

• sync with doctr to provide a way to load custom trained orientation models
• minor test updates

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.07%. Comparing base (08052bb) to head (c9aebf7).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   97.91%   98.07%   +0.15%     
==========================================
  Files          65       65              
  Lines        1968     1974       +6     
==========================================
+ Hits         1927     1936       +9     
+ Misses         41       38       -3     

Flag	Coverage Δ
unittests	98.07% <100.00%> (+0.15%)	⬆️

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