[w3c/payment-handler] PaymentInstruments is missing values() and entries() (#255)

PaymentInstruments is a great in following the pattern for async map-likes. But, it is missing two methods: values() and entries(). These are not super-useful, but it's good to be uniform across the platform for this sort of thing.

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https://github.com/w3c/payment-handler/issues/255