MdePkg/Include: Add HTTP definitions

MdePkg/Include: Add HTTP definitions

BZ #2915, https://bugzilla.tianocore.org/show_bug.cgi?id=2915

Add HTTP chunk transfer definitions.

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: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wang Fan <fan.wang@intel.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>