Port of  LDAP Wizard: get correct total no of users, groups and complete list of groups on big setups #9002

fix PHPdoc

Conflicts:
	apps/user_ldap/lib/connection.php

add method to count groups on LDAP

Conflicts:
	apps/user_ldap/lib/access.php

LDAP Wizard: count users and groups with the power of paged search

Conflicts:
	apps/user_ldap/lib/wizard.php

consolidate requirement check

fix PHPdoc

Conflicts:
	apps/user_ldap/lib/access.php

Wizard: get really all groups from LDAP by power of Paged Search

Conflicts:
	apps/user_ldap/lib/wizard.php

make all this work in an early configuration state in the wizard by marking  the config active and ignoring the validation state.

Conflicts:
	apps/user_ldap/lib/connection.php

simplify two methods a bit, because they are not used for group search anymore

Conflicts:
	apps/user_ldap/lib/wizard.php

remove unused vars; increase scrutinizer happiness