Adds two custom forms: DateForm and CheckBoxForm, to be used by future patches for improving dashboard features. These follow the same format as in the Horizon OpenStack Dashboard [1]. 1. https://opendev.org/openstack/horizon/src/branch/master/horizon/forms Change-Id: I3e708cb7e69778a4632b19cb355c7f595caaf21a Signed-off-by: Leonie Chamberlin-Medd <leonie@stackhpc.com>