[feature] Add whitelist hook

[felixdittrich92]

This PR:

• Add hook to handle recognition whitelisting with strategies
• Add corr tests & documentation

[codecov]

Codecov Report

❌ Patch coverage is 93.04348% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.85%. Comparing base (b45b899) to head (d5bb0ac).

Files with missing lines	Patch %	Lines
doctr/models/utils/pytorch.py	93.04%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2077      +/-   ##
==========================================
- Coverage   96.93%   96.85%   -0.09%     
==========================================
  Files         156      156              
  Lines        7415     7530     +115     
==========================================
+ Hits         7188     7293     +105     
- Misses        227      237      +10     

Flag	Coverage Δ
unittests	96.85% <93.04%> (-0.09%)	⬇️

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