BaseTools/Plugin: Add HostBasedUnitTestRunner plugin

https://bugzilla.tianocore.org/show_bug.cgi?id=2505

Add plugin to BaseTools to run host based unit tests.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bret Barkelew <Bret.Barkelew@microsoft.com>
Acked-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Plugin/HostBasedUnitTestRunner/HostBasedUnitTestRunner_plug_in.yaml

@@ -0,0 +1,12 @@
+##
+# IUefiBuildPlugin used to run any unittests that
+# were built on this build.
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+{
+  "scope": "host-test-win",
+  "name": "Windows Host-Based Unit Test Runner",
+  "module": "HostBasedUnitTestRunner"
+}