[w3c/webpayments-payment-handler] Suggestion: replace `PaymentWallets` with a property on `PaymentInstrument` (#153)

It seems like having two storage containers for payment instruments (`PaymentInstruments` and `PaymentWallets`) is unnecessarily heavy weight. If grouping is desirable, can we instead add an optional `paymentWallet` or `paymentInstrumentGroup` property the `PaymentInstrument` dictionary?

User agents could use the value of this property to group payment instruments for display in the same way they can now with `PaymentWallet` containers, but it would be much lighter weight and likely more attractive from an implementation perspective.

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https://github.com/w3c/webpayments-payment-handler/issues/153