Re: [w3c/payment-handler] Normative what happens when users closing the window opened by PaymentRequestEvent.openWindow (#299)

Does it make sense for us to have a `paymentRequestAborted` event or similar that is raised:
  1. If the user cancels the payment from the payment sheet, or
  2. If the merchant website aborts the payment request
  3. If the window that was opened through `openWindow` is closed by the user

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