MdePkg: Add header file for HTTP utilities protocol

MdePkg: Add header file for HTTP utilities protocol

This patch is used to add header files for HTTP utilities protocol.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Samer El-Haj-Mahmoud <samer.el-haj-mahmoud@hp.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18259 6f19259b-4bc3-4df7-8a09-765794883524