Contacts: allow to search contacts from ldap and add them to contact groups

[ArnY]

When nextcloud is used with a ldap backend it would be useful to allow the user to search in the ldap directory for contacts. It would be interesting both for browsing the directory (to get phone numbers, departments, etc.) and for creating contact groups with ldap contacts without the user having to create duplicate contacts (local & ldap).

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[alexsalex]

+1

[fauust]

+1

[mspenkov]

+1

[skjnldsv]

This is a bit of a duplicate with #1117.
I'm not really sure. We can't do both. Let's see!

[alexanderdd]

see also https://github.com/nextcloud/server/issues/693