Teach retry() about payerErrors

[marcoscaceres]

BUILD ON #715 - This is part 2. It adds:

• retry() argument for validation errors: retry(PaymentValidationErrors errorFields)
• PaymentValidationErrors dictionary
• PayerErrorFields dictionary

The following tasks have been completed:

• [x] Confirmed there are no ReSpec errors/warnings.
• [ ] Added Web platform tests (link)
• [ ] added MDN Docs (link)

Implementation commitment:

• [ ] Safari (link to issue)
• [ ] Chrome (link to issue)
• [ ] Firefox (link to issue)
• [ ] Edge (public signal)

Impact on Payment Handler spec?

Example

Via payerErrors, the user now knows what's actually wrong with the payment... however, there is no eventing model, so validation of user input cannot be done incrementally: That's part 3.

async function doPaymentRequest() {
  const request = new PaymentRequest(methodData, details, options);
  const response = await request.show();
  try {
    await recursiveValidate(request, response);
  } catch (err) { // retry aborted.
    console.error(err);
    return;
  }
  await response.complete("success");
}

async function recursiveValidate(request, response) {
  const promisesToFixThings = [];
  const payerErrors = await validatePayerInput(response);
  if (!payerErrors) {
    return;
  }
  await response.retry({ payerErrors });
  return recursiveValidate(request, response);
}

doPaymentRequest();

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