esp_modem: Add ConsoleCommand destructor

Commands are registered in Constructor. But there is now of deregistering it
This is needed for correct console re-construction,
for example with USB modem replugging.

components/esp_modem/examples/modem_console/main/console_helper.hpp

@@ -92,6 +92,11 @@ public:
      */
     explicit ConsoleCommand(const char *command, const char *help, const std::vector<CommandArgs> &args, std::function<bool(ConsoleCommand *)> f);
 
+    /**
+     * @brief Destructor of ConsoleCommand
+     */
+    ~ConsoleCommand();
+
     /**
      * @brief Utility getters of various params from the argument list
      */