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/UnitTestBootLib.h

@@ -0,0 +1,31 @@
+/** @file
+  Provides a library function that can be customized to set the platform to boot
+  from USB on the next boot.  This allows the test framework to reboot back to
+  USB.  Since boot managers are not all the same creating a lib to support
+  platform customization will make porting to new code base/platform easier.
+
+  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_BOOT_LIB_H__
+#define __UNIT_TEST_BOOT_LIB_H__
+
+/**
+  Set the boot manager to boot from a specific device on the next boot. This
+  should be set only for the next boot and shouldn't require any manual clean up
+
+  @retval EFI_SUCCESS      Boot device for next boot was set.
+  @retval EFI_UNSUPPORTED  Setting the boot device for the next boot is not
+                           supportted.
+  @retval Other            Boot device for next boot can not be set.
+**/
+EFI_STATUS
+EFIAPI
+SetBootNextDevice (
+  VOID
+  );
+
+#endif