Add a croping interface on /nutrition game

[raphael0202]

Using the new nutrition game, we can also ask the user to crop the nutrition table from the image.
Even if the user doesn't do so, we can select the image as a nutrition image if no nutrition image was selected.

Two endpoints that can help:

• to get the results of the object detection model that detects nutrition table: https://robotoff.openfoodfacts.org/api/v1/image_predictions?count=1&type=object_detection&model_name=nutrition_table&barcode=4335619022294&image_id=2. Image ID must be the raw (digit) image ID. If we get a detection with a score >= 0.5, we have good confidence in the model prediction. Otherwise it's probably better not to display the pre-crop.
• Get the language associated with the image: https://robotoff.openfoodfacts.org/api/v1/predictions?barcode=0070177115227&types=image_lang&count=100 (it's unfortunately not possible yet to filter by image ID)