[w3c/payment-request] Include payment handler information in response (#815)

We have heard use cases for merchants having information about the user's selected payment handler for a transaction, including:

 * Being able to debug issues
 * Security  / Trust in some payment handlers

This is most useful for standardized payment methods but may also be useful for URI-identified payment methods that allow for multiple payment handlers.

The original payment handler issue is 217:
 https://github.com/w3c/payment-handler/issues/217

I am not proposing this for a v1 feature. However, when we start to consider the issue we can return to a proposal to return two bits of information in the PR API response:

 handlerType: {'built-in', 'web', 'native')
 handlerID: {null, <origin>, <platform-specific> }

Ian



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