[w3c/browser-payment-api] Phone number format (#390)

What format should we use for phone numbers for `payerPhone` and `PayerAddress.phone`? I propose E.164, which looks like this: `"+15555555555"`. (For UI, Chrome will probably use E.123, which shows that same phone number in more human-readable format of `"+1 (555) 555-5555"`.)

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