fix: improve resources caching

[raphael0202]

• use a cache registry to know which functions are cached and to clear all cache easily
• clear all cache after request in api
• upgrade isort

[codecov]

Codecov Report

Attention: Patch coverage is 92.42424% with 5 lines in your changes missing coverage. Please review.

Project coverage is 54.94%. Comparing base (946c73b) to head (2ad1c2c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
robotoff/utils/cache.py	78.57%	3 Missing ⚠️
...y/neural/keras_category_classifier_3_0/__init__.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1492      +/-   ##
==========================================
+ Coverage   54.68%   54.94%   +0.25%     
==========================================
  Files          85       85              
  Lines        8800     8855      +55     
==========================================
+ Hits         4812     4865      +53     
- Misses       3988     3990       +2     

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