[TSR] table predictor integration

[felixdittrich92]

This PR:

• TablePredictor integration in OCRPredictor
• Add docs
• Add tests
• Add in demo/API

TODO:

• API
• Demo
• CleanUp

[codecov]

Codecov Report

❌ Patch coverage is 85.02674% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.80%. Comparing base (7c93ed8) to head (62416cf).

Files with missing lines	Patch %	Lines
doctr/models/predictor/pytorch.py	43.18%	25 Missing ⚠️
doctr/models/builder.py	96.55%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2096      +/-   ##
==========================================
- Coverage   97.01%   96.80%   -0.22%     
==========================================
  Files         166      166              
  Lines        8387     8569     +182     
==========================================
+ Hits         8137     8295     +158     
- Misses        250      274      +24     

Flag	Coverage Δ
unittests	96.80% <85.02%> (-0.22%)	⬇️

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