Re: [w3c/payment-request] Add PaymentResponse.onpayerdetailchange (#724)

> What would be your suggested good practice for figuring out which thing changed?

There is not way to detect which changed, just revalidate. So the question is mostly around validation of these values... 

```JS
response.onpayerdetailchange = ev => {
    const errors = {};
    const { payerName, payerEmail, payerPhone } = response; 
    object.assign(
       errors, validateEmail(payerEmail), validateName(payerName), validatePhone(payerPhone) 
    );
   if(Object.getOwnPropertyNames(x).length){
      response.retry(errors);
   }
}
```

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