LDAP backend to support sync of user manager data to NextCloud users

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Feature request

Which Nextcloud Version are you currently using: 31.0.5

Is your feature request related to a problem? Please describe.
I have to maintain Contacts org chart separately to the data available in OpenLDAP because there is no mapping for manager available.

Describe the solution you'd like
I would like to centrally manage user/contact Manager mappings in LDAP only and have it sync to NextCloud so that it shows in the Org chart correctly.

Describe alternatives you've considered
I could pull the LDAP user and manager data down to the NextCloud server and store in a file on disk, then call the occ command to automatically update the user manager field.

Additional context
N/A

Start by locating the LDAP attribute-mapping and user synchronization entry points in the ldap_contacts_backend repository, then trace how Nextcloud user manager data is stored and exposed to the Contacts org chart. The work is done when manager mappings can be maintained in LDAP, synchronized to Nextcloud users, and shown correctly in the org chart.