GraphQl-198: Products: access to related/up-sell/cross-sell product fields

[VitaliyBoyko]

Description (*)

PR For issue #198 Products: access to related/up-sell/cross-sell product fields
This PR added functionality for query/response with related products.

Manual testing scenarios (*)

Sample request

{
  products(filter: { sku: { eq: "product_dynamic_8" } }) {
    items {
      id
      name
      url_key
      categories {
        id
      }
      crosssell_products {
        items {
          name
          sku
          url_key
          canonical_url
          image {
            url
          }
          price {
            regularPrice {
              amount {
                value
              }
            }
            minimalPrice {
              amount {
                value
              }
            }
            maximalPrice {
              amount {
                value
              }
            }
          }
        }
      }
      upsell_products {
        items {
          name
          sku
          url_key
          canonical_url
          image {
            url
          }
          price {
            regularPrice {
              amount {
                value
              }
            }
            minimalPrice {
              amount {
                value
              }
            }
            maximalPrice {
              amount {
                value
              }
            }
          }
        }
      }
      related_products {
        items {
          name
          sku
          url_key
          canonical_url
          image {
            url
            label
          }
          price {
            regularPrice {
              amount {
                value
                currency
              }
              adjustments {
                amount {
                  value
                  currency
                }
                code
                description
              }
            }
            maximalPrice {
              amount {
                value
                currency
              }
              adjustments {
                amount {
                  value
                  currency
                }
                code
                description
              }
            }
            minimalPrice {
              amount {
                value
                currency
              }
              adjustments {
                amount {
                  value
                  currency
                }
                code
                description
              }
            }
          }
        }
      }
    }
  }
}

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[naydav]

@VitaliyBoyko
As was mentioned on demo, need to extract logic from CatalogGraphQl module to separate module like RelatedProductGraphQl

[ghost]

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