feat: add groupBy prop in recommendation shelf

[iago1501]

What problem is this solving?

We have a limitation in Recommendation queries where we always group by products, but, some customers, especially when talking about fashion segments, want to show also individual SKUs instead, this feature is responsible for allowing that.

Also, there's another limitation presented here that we are trying to cover. When grouping by products and calling the catalog cross selling API, we do a reduced search, in this reduced search, the total quantity of products returned is limited by 12, but, if we don't use this parameter the limit is 50, so, we are also increasing the possibility of the number of products returned by this query

How to test it?

Workspace
Site Editor

Add the block shelf.relatedProducts with the prop groupBy

  "shelf.relatedProducts": {
    "blocks": ["product-summary.shelf"],
    "props": {
      "recommendation": "similars",
      "groupBy": "NONE"
    }    
  },

Describe alternatives you've considered, if any.

Related to / Depends on

vtex-apps/search-resolver#467
vtex-apps/search-graphql#135

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