OPNSense/core 6a0abf0src/opnsense/mvc/app/library/OPNsense/Auth LDAP.php, src/www system_authservers.php

auth / ldap, add group sync

PR: https://github.com/opnsense/core/issues/3471

(cherry picked from commit 5f743941754294bd2651616484c8b97cf53ae26a)
(cherry picked from commit ccdd7f65860bb3e2fc991fb1039011fee49adcac)
(cherry picked from commit 24b90841d16bb9f2ab2dcadf57abf83c11b23c3c)
(cherry picked from commit 1d7f87352819e162fe8a3645f7df195cd4c92016)
DeltaFile
+94-2src/opnsense/mvc/app/library/OPNsense/Auth/LDAP.php
+47-1src/www/system_authservers.php
+141-32 files

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