Create a new user management based on keycloak (OAuth)
- 'user' replace the implementation
- new auth API endpoints
- test runs based on a keycloak mockup
- local keycloak via docker compose
- gui uses keycloak for login, logout, links to register, forget password, edit user, etc.
- install a keycloak on labdev
- backup restore for keycloak
- some tests on the real keycloak
- theme keycloak
- additional keycloak attributes
- a cache for get_user
- copy script for existing users to keycloak