feat(websocket): add unregister event to websocket client

components/esp_websocket_client/examples/target/main/websocket_example.c

@@ -227,6 +227,7 @@ static void websocket_app_start(void)
     xSemaphoreTake(shutdown_sema, portMAX_DELAY);
     esp_websocket_client_close(client, portMAX_DELAY);
     ESP_LOGI(TAG, "Websocket Stopped");
+    esp_websocket_unregister_events(client, WEBSOCKET_EVENT_ANY, websocket_event_handler);
     esp_websocket_client_destroy(client);
 }