Superset: OIDC authorization should support group to role mapping

[sameer916]

Like mentioned here for airflow :- stackabletech/issues#769

We want similar things for superset

LDAP GROUP Superset role
Admin Role -> Admin
Developer Role -> Alpha
Viewer Role -> Gamma

[sbernauer]

Superset can already load the users groups from OPA, it looks like a perfect fit for this: https://docs.stackable.tech/home/stable/superset/usage-guide/security/#_opa_role_mapping
You can use that in combination with user-info-fetcher to use Keycloak or AD groups for this