[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 99.10714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.97%. Comparing base (b45b899) to head (fcf080f).

Files with missing lines	Patch %	Lines
doctr/models/utils/pytorch.py	99.10%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2077      +/-   ##
==========================================
+ Coverage   96.93%   96.97%   +0.03%     
==========================================
  Files         156      156              
  Lines        7415     7527     +112     
==========================================
+ Hits         7188     7299     +111     
- Misses        227      228       +1     

Flag	Coverage Δ
unittests	96.97% <99.10%> (+0.03%)	⬆️

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