Allow another authentication provider for the Management/Task console

At the moment the Management and Task console are requiring as mandatory a Keycloak instance for the authentication.

If the user needs to do a quick tests (this is really common for developers and QE for example), a lighter authentication method could be really useful to speed up the activity.

An alternative to Keycloak could be an authentication method only for test based on a JVM property or a text file containing the username and password needed.