Start of Product Attributes implementation, #4105

[stephanegigandet]

For more background and details, please see #4105 and https://wiki.openfoodfacts.org/Product_Attributes

This is the start of the implementation of product attributes, that will be used by the new Flutter app and the personal search project.

This is an alpha phase. We will incrementally code and deploy the attributes. A lot of things may change as we add new attributes and use them in the new app (and possibly as a new function to personalize search results on the web site as well). To retrieve the attributes, they need to be explicitly requested (&fields=attributes_en) so it will not confuse existing apps.

Sample output:

https://fr.openfoodfacts.dev/api/v0/produit/3700214614266/chocolat-noir-perou-90-fruite-et-boise-alter-eco?fields=product_name,code,attributes_en

{
product: {
product_name: "Chocolat noir Pérou 90% fruité et boisé",
code: "3700214614266",
attributes_en: [
{
id: "labels",
name: "Labels",
attributes: [
{
status: "known",
id: "labels_organic",
description_short: "Promotes ecological sustainability and biodiversity.",
title: "Organic product",
description: "Organic farming aims to protect the environment and to conserve biodiversity by prohibiting or limiting the use of synthetic fertilizers, pesticides and food additives.",
name: "Organic product",
match: 100
},
{
status: "known",
description_short: "Fair trade products help producers in developping countries.",
id: "labels_fair_trade",
title: "Fair trade product",
description: "When you buy fair trade products, producers in developing countries are paid an higher and fairer price, which helps them improve and sustain higher social and often environmental standards.",
name: "Fair trade product",
match: 100
}
]
}
]
},
code: "3700214614266",
status: 1,
status_verbose: "product found"
}

[stephanegigandet]

Added Nutri-Score product attribute:

{
name: "Nutritional quality",
attributes: [
{
description: "",
id: "nutriscore",
title: "Nutri-Score D",
match: 30,
status: "known",
name: "",
description_short: "Poor nutritional quality"
}
],
id: "nutritional_quality"
},

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information

[stephanegigandet]

Added NOVA attribute:

{
name: "Food processing",
attributes: [
{
name: "NOVA group",
match: 50,
title: "NOVA 3",
status: "known",
description: "",
description_short: "Processed foods",
id: "nova"
}
],
id: "processing"
},

[teolemon]

It would be good in the future to split translations apart, otherwise LGTM