Re: [webauthn] Should an RP be able to provide finer grained authenticator filtering in attestation options? (#1688)

These are a confusing set of topics that's for sure. What I want is something like:

```js
navigator.credentials.get({
  publicKey: {
    challenge: new Uint8Array([/* bytes sent from the server */]),
    userVerification: true,
    authenticatorSelection: {
      attachment: "platform" // this is the missing piece
    }
  }
})
```

There's been some discussion of doing this via extensions, but also an acknowledgement that no user agent currently recognizes the extensions. Or did I miss a capability that already is in the spec? This could be accomplished with transport filtering as well, but I'm personally more interested in attachment.

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