Update PreProcessor and Resize logic

[felixdittrich92]

This PR:

• The object detection model / pipeline requires both image and padding mask as input
• Here we update Resize to return optional also a padding mask and the coressponding PreProcessor logic
• Updated tests

[codecov]

Codecov Report

❌ Patch coverage is 97.91667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.45%. Comparing base (c0ce28d) to head (6117daf).

Files with missing lines	Patch %	Lines
doctr/transforms/modules/pytorch.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2065   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files         147      147           
  Lines        6453     6486   +33     
=======================================
+ Hits         6224     6256   +32     
- Misses        229      230    +1     

Flag	Coverage Δ
unittests	96.45% <97.91%> (+<0.01%)	⬆️

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