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>

NetworkPkg/Library/DxeHttpIoLib/DxeHttpIoLib.inf

@@ -0,0 +1,45 @@
+## @file
+#  This library instance provides HTTP IO helper functions.
+#
+#  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001b
+  BASE_NAME                      = DxeHttpIoLib
+  MODULE_UNI_FILE                = DxeHttpIoLib.uni
+  FILE_GUID                      = 50B198F8-7986-4F51-A857-CFE4643D59F3
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = HttpIoLib| DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 EBC ARM AARM64 RISCV64
+#
+
+[Sources]
+  DxeHttpIoLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  NetworkPkg/NetworkPkg.dec
+
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  DpcLib
+  MemoryAllocationLib
+  PrintLib
+  UefiBootServicesTableLib
+
+[Protocols]
+  gEfiHttpProtocolGuid             ## SOMETIMES_CONSUMES
+
+[Pcd]
+  gEfiNetworkPkgTokenSpaceGuid.PcdMaxHttpChunkTransfer  ## SOMETIMES_CONSUMES