[w3c/webpayments] Pull filters out of payment method data (#170)

As discussed on the call, I recommend that the payment method filters be defined outside of the opaque payment method data (`data`).

```javascript
var supportedMethods = [{
    methods: ['urn:payment-method:basic-card-payment'],
    filters: {
        networks: ['visa', 'mastercard'],
        types: ['debit']
    },
    data: {
    ...
    }
}];
```

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