Introduces the concept of group search mode into the LDAP configuration. This also adds the filter and memberof search modes. The full description of these is included in the docs but the filter mode is the same mode as previous which is also the default and recommended value. The memberof mode should only be used by users who are aware of how the concept works as per the docs.
Closes#2161
Signed-off-by: James Elliott <james-d-elliott@users.noreply.github.com>
f79db588be