console: Add C++ guards to header

As reported on forum https://esp32.com/viewtopic.php?f=2&t=4478&p=19659

components/console/esp_console.h

@@ -13,6 +13,11 @@
 // limitations under the License.
 #pragma once
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stddef.h>
 #include "esp_err.h"
 
@@ -181,3 +186,7 @@ const char *esp_console_get_hint(const char *buf, int *color, int *bold);
  *      - ESP_ERR_INVALID_STATE, if esp_console_init wasn't called
  */
 esp_err_t esp_console_register_help_command();
+
+#ifdef __cplusplus
+}
+#endif