Re: [w3c/payment-handler] Why does a Payment App need to see the line items? (#91)

I would prefer that we have both semantic tagging and the `shareWithPaymentApp` boolean for explicit opt-in by merchant.

```idl
dictionary PaymentItem {
  required DOMString label;
  required PaymentCurrencyAmount amount;
  boolean pending = false;
  boolean shareWithPaymentApp = false;
  PaymentItemCategory category;
};

enum PaymentItemCategory {
  "subtotal",
  "tax",
  "shipping",
};
```

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