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/UnitTestPersistenceLib.h

@@ -0,0 +1,76 @@
+/** @file
+  This header file describes a library that contains functions to save and
+  restore unit test internal state, in case the test needs to pause and resume
+  (eg. a reboot-based test).
+
+  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_PERSISTENCE_LIB_H_
+#define _UNIT_TEST_PERSISTENCE_LIB_H_
+
+#include <UnitTestFrameworkTypes.h>
+
+#define UNIT_TEST_PERSISTENCE_LIB_VERSION   1
+
+/**
+  Determines whether a persistence cache already exists for
+  the given framework.
+
+  @param[in]  FrameworkHandle   A pointer to the framework that is being persisted.
+
+  @retval     TRUE
+  @retval     FALSE   Cache doesn't exist or an error occurred.
+
+**/
+BOOLEAN
+EFIAPI
+DoesCacheExist (
+  IN UNIT_TEST_FRAMEWORK_HANDLE  FrameworkHandle
+  );
+
+/**
+  Will save the data associated with an internal Unit Test Framework
+  state in a manner that can persist a Unit Test Application quit or
+  even a system reboot.
+
+  @param[in]  FrameworkHandle   A pointer to the framework that is being persisted.
+  @param[in]  SaveData          A pointer to the buffer containing the serialized
+                                framework internal state.
+
+  @retval     EFI_SUCCESS   Data is persisted and the test can be safely quit.
+  @retval     Others        Data is not persisted and test cannot be resumed upon exit.
+
+**/
+EFI_STATUS
+EFIAPI
+SaveUnitTestCache (
+  IN UNIT_TEST_FRAMEWORK_HANDLE  FrameworkHandle,
+  IN UNIT_TEST_SAVE_HEADER       *SaveData
+  );
+
+/**
+  Will retrieve any cached state associated with the given framework.
+  Will allocate a buffer to hold the loaded data.
+
+  @param[in]  FrameworkHandle   A pointer to the framework that is being persisted.
+  @param[in]  SaveData          A pointer pointer that will be updated with the address
+                                of the loaded data buffer.
+
+  @retval     EFI_SUCCESS       Data has been loaded successfully and SaveData is updated
+                                with a pointer to the buffer.
+  @retval     Others            An error has occurred and no data has been loaded. SaveData
+                                is set to NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+LoadUnitTestCache (
+  IN  UNIT_TEST_FRAMEWORK_HANDLE  FrameworkHandle,
+  OUT UNIT_TEST_SAVE_HEADER       **SaveData
+  );
+
+#endif