PrmPkg/Library/DxePrmContextBufferLib: Add host-based unit tests

Adds host-based unit tests for DxePrmContextBufferLib. This tests
each function in DxePrmContextBufferLib.

Any changes to DxePrmContextBufferLib moving forward must pass the unit
tests. The unit tests should be updated as needed if the library API
changes.

Cc: Andrew Fish <afish@apple.com>
Cc: Kang Gao <kang.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>

PrmPkg/Library/DxePrmContextBufferLib/UnitTest/DxePrmContextBufferLibUnitTestHost.inf

@@ -0,0 +1,46 @@
+## @file
+#  PRM Context Buffer Library Host-Based Unit Tests
+#
+#  Copyright (c) Microsoft Corporation
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010006
+  BASE_NAME                      = PrmContextBufferLibUnitTestHost
+  FILE_GUID                      = F1FB5F32-BDB5-4391-BD6D-979E90EE2DC3
+  MODULE_TYPE                    = HOST_APPLICATION
+  VERSION_STRING                 = 1.0
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64
+#
+
+[Sources]
+  DxePrmContextBufferLibUnitTest.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec
+  PrmPkg/PrmPkg.dec
+
+[Guids]
+  gZeroGuid
+
+[Protocols]
+  gPrmConfigProtocolGuid
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  MemoryAllocationLib
+  PrintLib
+  PrmContextBufferLib
+  UefiBootServicesTableLib
+  UnitTestLib