LDAP: Allow mapping of user active state

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Is your feature request related to a problem? Please describe.

We have an LDAP server providing users, which might get deactivated for certain times. With the current implementation we cannot determine whether a user is only temporarily disabled or removed from the LDAP server as to disable a user via LDAP it has to be "removed" for Nextcloud (e.g. through filters).

However, then we cannot automatically delete users, which are really deleted from LDAP.

Describe the solution you'd like

Map an active attribute from LDAP to Nextcloud.

Describe alternatives you've considered

We considered not using LDAP alltogether, e.g. using the API directly for user provisioning. However, this seems a bit overkill as it really is only a small feature missing.