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

Concretely, one sets the instrumentKey on an Instrument through the PaymentInstruments interface, so we will have to revisit that interface. Today it has these methods:
delete, get, keys, has, set, clear. How do these behave when an Instrument has a "default"
key in addition to its "otherwise" key? In particular, does keys() return the default key?

For example:

* delete(instrumentKey): works with all keys including default.
* get(instrumentKey): works on all keys including default
* has(instrumentKey): works on all keys including default
* set(instrumentKey, InstrumentDetails): works on all non-default keys
* setDefaultKey(instrumentKey,defaultKey): Makes the Instrument the default and assigns second key. 
* getDefaultKey(): returns defaultKey if specified, otherwise null
* keys(): works on all non-default keys. (I exclude the defaultKey so that you can do count(keys()) and determine the number of Instruments.
* clear(): works on all Instruments

Ian



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