chore(api): improve attachments performance

[icazevedo]

What's the purpose of this pull request?

This PR improves attachments overall architecture. Related to #1304

How it works?

This PR organizes additionalProperty a little bit better, adds propertyID to PropertyValues (which improves client-side performance) and fixes an inconsistency regarding attachments on the validateCart mutation.

How to test it?

JSON variables of the graphql query to the validateCart mutation:

{
  "cart": {
    "order": {
      "orderNumber": "911b0ceef77e4b98b9ca250a5d2fab2b",
      "acceptedOffer": [
        {
          "price": 602.78,
          "listPrice": 834.97,
          "seller": {
            "identifier": "1"
          },
          "quantity": 1,
          "itemOffered": {
            "sku": "2000586",
            "image": [
              {
                "url": "http://storeframework.vtexassets.com/arquivos/ids/177382/assumenda.jpg?v=637753139967300000",
                "alternateName": "hic"
              }
            ],
            "name": "Bells add-ons",
            "additionalProperty": [
              {
                "name": "1-3-lines",
                "value": "{\"Line 1\":\"1\",\"Line 2\":\"2\",\"Line 3\":\"3\"}",
                "valueReference": "ATTACHMENT"
              }
            ]
          }
        }
      ]
    }
  }
}

Starters Deploy Preview

https://github.com/vtex-sites/nextjs.store/pull/47
vtex-sites/gatsby.store#53

References

This PR improves on #1304 by moving the propertyID computation to the backend

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