[w3c/webpayments-payment-apps-api] Pass along a Transaction ID (#47)

I believe that users of Payment Apps would benefit from their App(s) being able to know more about each transaction that is processed.  One way to facilitate this is to include a transaction ID in the PaymentAppRequestData item.  

I would be happy to provide a PR if the group is open to this suggestion.

Note: This assumes that the group agrees with my suggestion in https://github.com/w3c/browser-payment-api/issues/287 that a transaction ID can be supplied by the merchant in the first place.

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