Re: [w3c/payment-handler] What happens when clearing site data? (#236)

So yeah, looks like we need to change the API to make this "credential" storage. We should decouple  `PaymentInstruments` from a SW registration, and then link them together somehow... don't know what that would be yet.. like:

```Js
await PaymentInstruments.set("visa1", cardDetails);

const reg = await navigator.serviceWorker.ready;
reg.claimPaymentHandlingStuffNamingIsHard();
```

@rsolomakhin, thoughts? 

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