Integrate nutrition extraction model

[raphael0202]

Problem

A LayoutLMv3 model was fined-tuned on the nutrition extraction dataset: https://huggingface.co/openfoodfacts/nutrition-extractor.
Integrate it in production, by:

• exporting it to ONNX (using optimum library)
• integrating to Robotoff

[teolemon]

One nice thing would be Robotoff writing a data quality tag whenever the detected values and the actual values don't match (typically outdated images where the contributor hasn't updated the values.)
We could then flag false positives using Nutri-Patrol