Support log in and decrypt with passkeys

A week ago Bitwarden added support to log in and decrypt the vault using passkeys/WebAuthn. Supporting this would be great for those who prefer security keys etc. over typing a master password every time.

I am not sure if all changes are contained within the clients and updating the web frontend is sufficient or if this requires new endpoints on the backend. I fear the latter might be the case as the process requires the relying party to provide a salt if I understand correctly which the key uses to derive the unlocking phrase.