Re: [w3c/permissions] Mechanism for permission feature-detection? (#134)

`permissions.query({name: "Unknown"})` rejects with a `TypeError`, while `permissions.query({name: "Denied"})` fulfils with a [`PermissionStatus`](https://w3c.github.io/permissions/#permissionstatus) containing `{state: "denied"}`.

It might make sense to add a more explicit operation to check whether a permission is supported, but they're at least distinguishable now.

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