teleport: Add explicit WebAuthn config, not just U2F.
teleport: Add explicit WebAuthn config, not just U2F.

WebAuthn is the default, replacing U2F, in Teleport 10 and above[1].
While Teleport can derive a WebAuthn configuration from a U2F
configuration[2], it's useful to be explicit.

[1]: https://goteleport.com/docs/access-controls/guides/webauthn/
[2]: https://goteleport.com/docs/access-controls/guides/webauthn/#u2f

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