[w3c/browser-payment-api] Aborting of in progress push payments (#473)

With respect to Roy's demo of push payments using the 'fb' PMI, I think it would be useful to more specifically define the behaviour of when Abort() is called when a payment in 'processing'.

In particular, I wonder if a specific state of "Processing" would be useful to define in the state machine in addition to "Created", "Interactive" and "Closed".

This would allow the definition of a specific exception to be thrown in the abort() algorithm to disambiguate the various reasons for failure, e.g. "AlreadyProcessing" 

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