Add virtual products to cart

[rogyar]

Description (*)

This PR adds a possibility to add virtual products to the shopping cart

Fixed Issues (if relevant)

1. [Cart Operations] Add virtual product to Cart #145: [Cart Operations] Add virtual product to Cart

Manual testing scenarios (*)

Use the following query with your own values to add a virtual product

mutation {
  addVirtualProductsToCart(
    input: {
      cart_id: "JJErKhk2dtVa7BOyJDxPH2fv0DcGZkA1", 
      cartItems: [
        {
          data: {
            sku: "virt", 
            qty: 2
          }          
        }
      ]
    }
  ) {
    cart {
      cart_id
      items {
        id
      }
    }
  }
}

[rogyar]

@naydav Could you check my questions in the review, please? Thanks

[rogyar]

Could we reuse resolver from addSimpleProductsToCart (rename in order to have a more universal name) here? Resolvers for simple and virtual products are identical.

[naydav]

Looks like we need to reuse configurable for simple because the code is the same (and we will have copy paste detector fail)

[rogyar]

If we are not going to use the resolver for virtual/simple products, should we add an additional check for the product type in a resolver?
Currently we can add simple product via virtual product mutation and vice versa

[naydav]

We need to have 2 different resolvers with checking of product type, but all general logic should be moved to Model in a separate class

Also, need to cover functionality with API-functional tests (including negative scenarios with a wrong product type)
Thanks

[ghost]

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[keharper]

Documented as part of magento/devdocs#4502