UnitTestFrameworkPkg: Add gmock support to GoogleTestLib

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4389

* Add gmock support to GoogleTestLib
* Add FunctionMockLib library class and library instance
* Add GoogleTest extension to GoogleTestLib.h for CHAR16 type
* Add GoogleTest extension to GoogleTestLib.h for buffer types
* HOST_APPLICATION only supports IA32/X64

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Chris Johnson <chris.n.johnson@intel.com>
Reviewed-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Oliver Smith-Denny <osde@linux.microsoft.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

UnitTestFrameworkPkg/Library/FunctionMockLib/FunctionMockLib.inf

@@ -0,0 +1,31 @@
+## @file
+#  This module provides FunctionMockLib Library implementation.
+#
+#  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION     = 0x00010018
+  BASE_NAME       = FunctionMockLib
+  MODULE_UNI_FILE = FunctionMockLib.uni
+  FILE_GUID       = DF1CAF2F-D584-4EC1-9ABF-07E8B10AD560
+  MODULE_TYPE     = HOST_APPLICATION
+  VERSION_STRING  = 0.1
+  LIBRARY_CLASS   = FunctionMockLib
+
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  FunctionMockLib.c
+
+[LibraryClasses]
+  GoogleTestLib
+  SubhookLib
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec