WebAuthn: do something with WebAuthnHelper

[FroMage]

During my struggles with WebAuthn I wrote a helper class in quarkus-test-security-webauthn which dumps webauthn registration and login requests to human-readable form that is very useful because otherwise the things are a mix of json, cbor and binary.

I need to document this and perhaps use it either in logs or via the Dev UI.

[quarkus-bot]

/cc @pedroigor (bearer-token), @sberyozkin (bearer-token,jwt,security)