The ToastMgr struct is used to manage toast notifications in a Dioxus application using Bootstrap. It has four properties:
show_toast: A boolean indicating whether a toast notification should be shown.
toast_message: A string containing the message to be displayed in the toast notification.
toast_type: A character indicating the type of toast notification (I for info, S for success, W for waiting, C for caution/warning, E for error).
wait_msg: A string containing the default waiting message.