Integration of LDAP groups and user groups

[Lusti67]

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Improvement of LDAP functionality

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If you have defined LDAP for backend authentication, it should be possible to import the LDAP groups under Groups and use these groups for authorizations. This is not possible at the moment.

The same applies to user creation. Here you should be able to define which users should be imported at all, e.g. users who are members of group ABC should be created automatically.

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Additional context
Similar imports should be possible

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