ws_client: fix for not sending ping responses, updated to pass events also for PING and PONG messages, added interfaces to send both binary and text data

closes https://github.com/espressif/esp-idf/issues/3982


* Original commit: espressif/esp-idf@abf9345b85

examples/protocols/websocket/main/websocket_example.c

@@ -44,6 +44,7 @@ static void websocket_event_handler(void *handler_args, esp_event_base_t base, i
 
         case WEBSOCKET_EVENT_DATA:
             ESP_LOGI(TAG, "WEBSOCKET_EVENT_DATA");
+            ESP_LOGI(TAG, "Received opcode=%d", data->op_code);
             ESP_LOGW(TAG, "Received=%.*s\r\n", data->data_len, (char*)data->data_ptr);
             break;
         case WEBSOCKET_EVENT_ERROR: