Add serving size and quantity in search hits

[Biliwaks]

Problem

The serving size and quantity parameters are missing from hits when querying on search.openfoodfact.org

Proposed solution

Add serving size and quantity as found in responses from world.openfoodfacts.org/product

Additional context

This is very useful for showing the serving size directly on search results

[Drexel2k]

This also the main reason that prevents me from using this API...

[petpaa]

Same pattern for me: search hits are too thin compared to the product API. I need alcohol by volume (alcohol_100g / % vol). Without that on the hit (or inside nutriments), I can’t rely on search-a-licious alone and end up on search.pl or a product fetch per row.