[w3c/payment-request] Localization and string metadata for descriptions (#948)

2.2 Describing what is being paid for 
https://www.w3.org/TR/2020/CR-payment-request-20201203/#describing-what-is-being-paid-for

Example 2 contains this:
```
const details = {
  id: "super-store-order-123-12312",
  displayItems: [
    {
      label: "Sub-total",
      amount: { currency: "USD", value: "55.00" },
    },
    {
      label: "Sales Tax",
      amount: { currency: "USD", value: "5.00" },
      type: "tax"
    },
  ],
  total: {
    label: "Total due",
    // The total is USD$65.00 here because we need to
    // add shipping (below). The selected shipping
    // costs USD$5.00.
    amount: { currency: "USD", value: "65.00" },
  },
};
```

The value `label` contains natural language text with no language metadata or base direction information. The same usage is found in other example sections that follow. I18N recommends that there be a means of providing this metadata so that the document's processor can display the value correctly.

This comment is probably a duplicate of #327. It is also related to #946 

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