Add JsonLoadString function to load a NULL terminated-string JSON Signed-off-by: Abner Chang <abner.chang@hpe.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Nickle Wang <nickle.wang@hpe.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Nickle Wang <nickle.wang@hpe.com>