MdeModulePkg: Define the VariablePolicyLib

https://bugzilla.tianocore.org/show_bug.cgi?id=2522

VariablePolicy is an updated interface to
replace VarLock and VarCheckProtocol.

Add the VariablePolicyLib library that implements
the portable business logic for the VariablePolicy
engine.

Also add host-based CI test cases for the lib.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Bret Barkelew <brbarkel@microsoft.com>
Signed-off-by: Bret Barkelew <brbarkel@microsoft.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Acked-by: Jian J Wang <jian.j.wang@intel.com>

MdeModulePkg/Library/VariablePolicyLib/VariablePolicyLib.uni

@@ -0,0 +1,12 @@
+// /** @file
+// VariablePolicyLib.uni
+//
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Library containing the business logic for the VariablePolicy engine"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "Library containing the business logic for the VariablePolicy engine"