feat: add Yolov8 model for nutrition table detection

[raphael0202]

Change FasterRCNN model for nutrition detection by newly trained yolov8n.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.40%. Comparing base (a02ec39) to head (c35e9a9).
Report is 6 commits behind head on main.

Files	Patch %	Lines
robotoff/cli/main.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1365      +/-   ##
==========================================
- Coverage   56.41%   56.40%   -0.01%     
==========================================
  Files          79       79              
  Lines        7927     7930       +3     
==========================================
+ Hits         4472     4473       +1     
- Misses       3455     3457       +2     

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