Re: [w3c/payment-request] Standardize phone number format (#652)

@asolove-stripe wrote:
> Can we at least require numbers to include country code?

As I said, the problem is that we can't really specify how to do the conversion without standardizing libphonenumber's parse algorithm.  

What we might need is a `.payerCountry` attribute (or `.payerPhoneCountry`). Which can then be fed into libphonenumber (or similar lib), so that:

```js
// given "(408) 123-4567", and "US"
const phone = phoneUtil.parse(response.payerNumber, response.payerCountry);
// Yields, for instance, "+14081234567"
```


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