Add Virtual List View (VLV) capabilities to LDAP connector

Request to add Virtual List View (VLV) capabilities to LDAP connector to handle the case of large result sets. During materialization, the query was timing out on the LDAP server before it completed and caused the materialization to fail. This was worked around by increasing the idle timeout on the LDAP server, but a request was made to implement the VLV capabilities in order to avoid the need to increase the idle timeout as the LDAP results grow larger.