Function set_callbacks_c 

#[unsafe(no_mangle)]
pub extern "C" fn set_callbacks_c(
    tab_id: TabId,
    on_load_end_callback: *const c_void,
    on_paint_callback: *const c_void,
    on_dom_action_callback: *const c_void,
) -> i32

See set_callbacks. NOTE: The function pointers may be null OR the definition as defined by On_CallbackC. Else this will trigger ub