[w3c/webpayments-methods-card] Behavior when method-specific data is invalid (#20)

If someone writes this:
```javascript
new PaymentRequest([{supportedMethods: ["basic-card"], data: {supportedNetworks: 0}}], shoppingCart);
```
Should the constructor throw, because `supportedNetworks` must be a list according to this spec? The alternative is to pass this information to the payment app as-is and let it decide what to do with it. If we pass to the app, it would be great to clearly define the expected behavior for invalid method-specific data.

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https://github.com/w3c/webpayments-methods-card/issues/20