UnitTestFrameworkPkg: Add public and private interfaces

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

Add public interfaces for use by unit test implementations.

* Include path to cmocka library interfaces.
* PcdUnitTestLogLevel to set the unit test logging message
  level to filter log messages.

Add private interfaces that are used by UnitTestLib
implementations.

* [Private] UnitTestBootLib - Set boot next to continue unit
  tests across a reboot.
* [Private] UnitTestPersistenceLib - Save unit test framework
  state to a persistent storage device.
* [Private] UnitTestResultLib - Output unit test results to a
  console device.
* [Private] UnitTestFrameworkTypes.h - Internal structures
  used by UnitTestLib implementations to keep track if unit
  test frameworks, unit test suites, and unit tests along with
  the serialized storage format to save a unit test framework
  state to persistent storage.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bret Barkelew <Bret.Barkelew@microsoft.com>

UnitTestFrameworkPkg/PrivateInclude/Library/UnitTestResultReportLib.h

@@ -0,0 +1,27 @@
+/** @file
+  Provides a unit test result report.  This allows new result output formats to
+  be easily customized.
+
+  Copyright (c) Microsoft Corporation.<BR>
+  Copyright (c) 2019 - 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __UNIT_TEST_RESULT_REPORT_LIB_H__
+#define __UNIT_TEST_RESULT_REPORT_LIB_H__
+
+#include <UnitTestFrameworkTypes.h>
+
+/**
+Method to produce the Unit Test run results
+
+@retval Success
+**/
+EFI_STATUS
+EFIAPI
+OutputUnitTestFrameworkReport (
+  IN UNIT_TEST_FRAMEWORK_HANDLE  FrameworkHandle
+  );
+
+#endif