FR: Proper parent groups

[samip5]

Is your feature request related to a problem? Please describe. I would like to be able to have a user belong to the parent group, without having to also include that.

Describe the solution you'd like Create a group a with a parent group b, and then add user a to group b. It should inherit group a.

Additional context

Similar requests exist for LDAP: https://github.com/goauthentik/authentik/issues/3284 https://github.com/goauthentik/authentik/issues/1278