Major Description
Registration records, tokens, etc that are relevant for google authenticator as an mfa provider should be optionally stored in an LDAP backend for Syncope WA.
The LDAP support for GAuth already exists:
https://apereo.github.io/cas/6.5.x/mfa/GoogleAuthenticator-Authentication-Registration-LDAP.html
The task here is to augment the google auth configuration to support appropriate LDAP settings, and then conditionally activate the module when settings specified. If settings are undefined, we defer to Syncope as the backend service (which is the default today)