adding commands to fetch and changee ruler state
'.uno:RulerState' and '.uno:RulerStateChange'

Change-Id: I66107039a7ae5893691feb45c8ab2e4aa476ea76
Reviewed-on: https://gerrit.libreoffice.org/40727Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: pranavk <pranavk@collabora.co.uk>