[w3c/payment-request] PaymentShippingOption as a subclass of DisplayItem (#681)

Given the overlap, should we consider `PaymentShippingOption` inheriting from `PaymentItem` :

```Java
dictionary PaymentItem {
  required DOMString label;
  required PaymentCurrencyAmount amount;
  boolean pending = false;
};

dictionary PaymentShippingOption : PaymentItem {
  required DOMString id;
  boolean selected = false;
};
```

With `pending` being a somewhat meaningless member for `PaymentShippingOption`? 



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