Re: [w3c/payment-handler] User consent and permissions (#239)

@rsolomakhin,

> The payment handler website may want to know whether the user granted the permission. ... Therefore, it may be more clear to rename .requestPermission() into .requestPermissionState(). 

Note that this query can already be done with [`navigator.permissions.query`](https://w3c.github.io/permissions/#dom-permissions-query), but the name of the permission will need to be passed.

For example:

```js
const result = await navigator.permissions.query({name: 'paymenthandler'});

// result.state is `granted`, `denied`, `prompt`
```

More examples here:

https://developer.mozilla.org/en-US/docs/Web/API/Navigator/permissions

Using `requestPermission` mirrored the Notifications API, but I think `requestPermissionState` would be a new invention? I'm not sure if we need it in that case.

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