feat(openthread): add common components for openthread examples

examples/openthread/ot_common_components/ot_examples_br/include/ot_examples_br.h

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+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ *
+ * OpenThread Command Line Example
+ *
+ * This example code is in the Public Domain (or CC0 licensed, at your option.)
+ *
+ * Unless required by applicable law or agreed to in writing, this
+ * software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+#include "esp_err.h"
+#include "esp_openthread.h"
+
+/**
+ * @brief   Start the border router features of OpenThread.
+ *
+ * @note Calling this function will make the device connect to the Wi-Fi or Ethernet,
+ *       and initialize the border router feature.
+ *
+ * @return
+ *      - ESP_OK on success.
+ *      - ESP_FAIL on failure.
+ *
+ */
+esp_err_t esp_openthread_border_router_start(void);
+
+/**
+ * @brief   Stop the border router features of OpenThread.
+ *
+ * @note Calling this function will make the device deinitialize the border router feature.
+ *
+ */
+void esp_openthread_border_router_stop(void);