Re: [w3c/payment-handler] Ability to set default instrument for given handler (#173)

Hi Adrian,

Using your example as a starting point, here is what I had in mind:

- I install BobPay which allows me to identify a default payment instrument. BobPay explains to me that when I am am presented with the default payment instrument and select it, payment will be super fast with minimal friction.

- Via Payment Handler API BobPay registers three payment instruments;
   * Blue-when-displayed-as-default with instrument key k1, identified as the default
   * Blue with instrument key k2
   * Green with instrument key k3
   
   Note that this happens under the hood and the user doesn't have to do anything
   special other than identify that blue is the default. There's a bit of redundancy
   in the registration, but that's a feature.

- Payment Handler API states that the browser displays either k1 or k2+k3.

Thus:
 * Some details for the blue payment instrument will be common to k1 and k2.
 * Some information could usefully be different, such as the displayed string
 * Because the instrumentKeys differ, the handler knows which one the user selected.
 * The behavior for k1 and and k2 could differ even if the card number (etc.) is the
    same.

I should have provided this example in my post; thanks for prompting it.

Ian



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