Add price including tax to `CartItemPrices` in GraphQL API

[TimonVS]

Description (*)

I'd like to be able to show the price of an individual item including taxes. Currently, you can only retrieve the row total including tax or the price of an individual item excluding tax.

Expected behavior (*)

Add a field price_including_tax to CartItemPrices:

query {
  cart(cart_id: "<cart id here>") {
    items {
      id
      quantity
      prices {
        # excluding tax
        price {
          currency
          value
        }
        # new field
        price_including_tax {
          currency
          value
        }
        row_total_including_tax {
          currency
          value
        }
      }
    }
  }
}

Benefits

Shopping carts usually show the price of an individual item including taxes, even the default theme in Magento does that.

Additional information

[m2-assistant]

Hi @TimonVS. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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[TimonVS]

@magento give me 2.4-develop instance

[magento-engcom-team]

Hi @TimonVS. Thank you for your request. I'm working on Magento 2.4-develop instance for you

[magento-engcom-team]

Hi @TimonVS, here is your Magento instance.
Admin access: https://i-29057-2-4-develop.instances.magento-community.engineering/admin_1605
Login: be5793dd Password: f0c0d6c26ec2
Instance will be terminated in up to 3 hours.