MdePkg/Include: Definitions of EFI REST JSON Structure Protocol

MdePkg/Include: Definitions of EFI REST JSON Structure Protocol

Add definitions of EFI REST JSON Structure according to UEFI spec
2.8 Section 29.7.3 EFI REST JSON Resource to C Structure Converter.

Signed-off-by: Abner Chang <abner.chang@hpe.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Fan Wang <fan.wang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>