[example] Add example to tests optional attributes of migrated clusters along with the script to verify.

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components/esp_matter/data_model/esp_matter_optional_attribute.h

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+// Copyright 2026 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#pragma once
+
+#include "sdkconfig.h"
+#ifdef CONFIG_ESP_MATTER_ENABLE_OPTIONAL_ATTRIBUTES
+
+#include <esp_matter_attribute.h>
+
+namespace esp_matter {
+namespace cluster {
+
+namespace basic_information {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* basic_information */
+
+namespace boolean_state_configuration {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* boolean_state_configuration */
+
+namespace electrical_energy_measurement {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* electrical_energy_measurement */
+
+namespace electrical_power_measurement {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* electrical_power_measurement */
+
+namespace ethernet_network_diagnostics {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* ethernet_network_diagnostics */
+
+namespace general_diagnostics {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* general_diagnostics */
+
+namespace occupancy_sensing {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* occupancy_sensing */
+
+namespace resource_monitoring {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* resource_monitoring */
+
+namespace software_diagnostics {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* software_diagnostics */
+
+namespace time_synchronization {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* time_synchronization */
+
+namespace wifi_network_diagnostics {
+esp_err_t create_optional_attributes(cluster_t *cluster);
+} /* wifi_network_diagnostics */
+
+} /* cluster */
+} /* esp_matter */
+
+#endif /* CONFIG_ESP_MATTER_ENABLE_OPTIONAL_ATTRIBUTES */