NetworkPkg/Library: Implementation of Http IO Helper Library

NetworkPkg/Library: Implementation of Http IO Helper Library

Add HTTP IO helper library which could be used by HTTP applications
such as HTTP Boot, Redfish HTTP REST EX driver instance and etc.

Signed-off-by: Abner Chang <abner.chang@hpe.com>
Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>