87 Fetch attribute values and labels for customAttributeMetadata

[klimart]

#87
Implemented:
It would be really useful to be able to get all the possible values and labels for "select" attributes. For example with the following request there is currently no way to get all the values and labels for the "color" attribute.

[magento-cicd2]

All committers have signed the CLA.

[klimart]

Sample query:

{
  customAttributeMetadata(
    attributes: {
      attribute_code: "color"
      entity_type: "4"
    }
  ) {
    items {
      attribute_code
      entity_type
      attribute_type
      attribute_options {
        value
        label
      }
    }
  }
}