Re: [webauthn] FIDO Payment Support (#1570)

@adrianhopebailie I was probably a bit quick regarding the selection thing...

Could this work?
```code
const methodData = [{
  supportedMethods: "https://emvco.com/spc",
  data: { 
      supportedNetworks: ["visa", "mastercard"] 
  }
}, {
    supportedMethods: "https://europeanpaymentsinitiative.com/spc"
}]
```
Both methods would then subscribe to the SPC method during payment credential enrollment.  This would enable merchants to either use individual "pay buttons" for each payment method, or support collections of useful methods to their liking.

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