feat: add multiple triton backend

[raphael0202]

• allow to run inference on a distinct Triton server
• improve worker task dispatch
• add a new CLI command to run category detection on the full DB

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (cf12304) 57.53% compared to head (fe0c380) 57.33%.

Files	Patch %	Lines
robotoff/cli/main.py	7.69%	24 Missing ⚠️
robotoff/workers/tasks/product_updated.py	33.33%	6 Missing ⚠️
robotoff/prediction/object_detection/core.py	25.00%	3 Missing ⚠️
robotoff/triton.py	50.00%	3 Missing ⚠️
...y/neural/keras_category_classifier_3_0/__init__.py	50.00%	2 Missing ⚠️
robotoff/prediction/ingredient_list/__init__.py	33.33%	2 Missing ⚠️
robotoff/workers/tasks/import_image.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1314      +/-   ##
==========================================
- Coverage   57.53%   57.33%   -0.21%     
==========================================
  Files          79       79              
  Lines        7793     7835      +42     
==========================================
+ Hits         4484     4492       +8     
- Misses       3309     3343      +34     

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