Add ability to have a custom front-end TOTP screen

[Wiejeben]

I would like to have the ability to use a fully custom Twig front-end for the TOTP screen as to make the user experience consistent with the login/registration/reset-password look and feel.

I can imagine it could be complicated for Passkeys, but since our users are only able to use the 6 digit code it does limit the complexity of this page.