Implement Robotoff nutrition prediction route

[teolemon]

What

• Implement Robotoff nutrition prediction route
• https://openfoodfacts.github.io/robotoff/references/api/#tag/Predict/paths/~1predict~1nutrition/get
• Related smoothie issue: Offer in-line validation of Robotoff predictions for nutrition facts smooth-app#3278

[monsieurtanuki]

@teolemon @raphael0202 Not really sure what we try to achieve here, but maybe I'm mislead by my unsuccessful tests.

I get the following result with https://robotoff.openfoodfacts.org/api/v1/predict/nutrition?barcode=7300400481588&image_ids=55:

{"predictions":[],"image_ids":["55"]}

While the image 55 is something like that:

Other points:

• we don't specify language or country, which is also disconcerting
• "imageIds" images can be big and include much more that nutrition facts, which may be problematic (for the AI) in order to focus on nutrition only

[raphael0202]

The current endpoint only works well on "text" nutrition tables. I would be in favor of waiting for a proper generic model for nutrition information extraction to be developed before its integration in Smoothie.