esp_http_server: update httpd_queue_work() API to use semaphore

Closes: https://github.com/espressif/esp-idf/issues/8440

components/esp_http_server/src/esp_httpd_priv.h

@@ -107,6 +107,9 @@ struct httpd_data {
     httpd_config_t config;                  /*!< HTTPD server configuration */
     int listen_fd;                          /*!< Server listener FD */
     int ctrl_fd;                            /*!< Ctrl message receiver FD */
+#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
+    SemaphoreHandle_t ctrl_sock_semaphore;  /*!< Ctrl socket semaphore */
+#endif
     int msg_fd;                             /*!< Ctrl message sender FD */
     struct thread_data hd_td;               /*!< Information for the HTTPD thread */
     struct sock_db *hd_sd;                  /*!< The socket database */