Add project config to ESP all-clusters-app to enable the unit test defines

Author: mkardous-silabs

examples/all-clusters-app/esp32/main/Kconfig.projbuild

@@ -59,6 +59,10 @@ menu "Demo"
             depends on IDF_TARGET_ESP32H2
     endchoice
 
+    config CHIP_PROJECT_CONFIG
+        string "CHIP Project Configuration file"
+        default "main/include/CHIPProjectConfig.h"
+
     choice
       prompt "Rendezvous Mode"
       default RENDEZVOUS_MODE_BLE if BT_ENABLED

examples/all-clusters-app/esp32/main/include/CHIPProjectConfig.h

@@ -0,0 +1,38 @@
+/*
+ *
+ *    Copyright (c) 2023 Project CHIP Authors
+ *    All rights reserved.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/**
+ *    @file
+ *          Example project configuration file for CHIP.
+ *
+ *          This is a place to put application or project-specific overrides
+ *          to the default configuration values for general CHIP features.
+ *
+ */
+
+#pragma once
+
+/**
+ * @def CONFIG_BUILD_FOR_HOST_UNIT_TEST
+ *
+ * @brief Defines whether we're currently building for unit testing, which enables a set of features
+ *        that are only utilized in those tests. This flag should not be enabled on devices. If you have a test
+ *        that uses this flag, either appropriately conditionalize the entire test on this flag, or to exclude
+ *        the compliation of that test source file entirely.
+ */
+#define CONFIG_BUILD_FOR_HOST_UNIT_TEST CONFIG_BUILD_CHIP_TESTS