Re: [w3c/payment-request] Should PaymentItems have a type? (#163)

Perhaps the ideal non-breaking change is adding 'tax`, `shipping`, and `subtotal` elements to `PaymentDetails`, similar to `total`.

```javascript
const paymentRequest = new PaymentRequest(
  [{supportedMethods: 'basic-card'}],
  {
    subtotal: {
      label: 'Sub Total',
      amount: {
        currency: 'USD',
        value: '6.00',
      },
    },
    shipping: {
      label: 'Shipping',
      amount: {
        currency: 'USD',
        value: '3.00',
      },
    },
    tax: {
      label: 'Tax',
      amount: {
        currency: 'USD',
        value: '1.00',
      },
    },
    total: {
      label: 'Total',
      amount: {
        currency: 'USD',
        value: '10.00',
      },
    },
    displayItems: aVeryLongListHere,
  });
```

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