Re: [w3c/payment-request] Include payment handler information in response (#815)

Can we reuse the field names `"platform"` and `"id"` from [`ExternalApplicationResource`](https://w3c.github.io/manifest/#dom-externalapplicationresource) dictionary? Chrome already parses it in web app manifests to authenticate native Android payment apps.

Android:
```json
"handler": {
  "platform": "play",
  "id": "com.example.app1",
}
```

Web:
```json
"handler": {
  "platform": "web",
  "id": "https://app1.example.com",
}
```

Built-in:
```json
"handler": {
  "platform": "built-in",
  "id": null,
}
```


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