Begin preloading an image object's image data in the background.
Once the background task is complete the event @[.load,done] will be emitted if loading succeeded, @[.load,error] otherwise.
Since 1.23
Overridden from Efl.Gfx.Image_Load_Controller.load_async_start.
load_async_start @pure_virtual {}
void efl_gfx_image_load_controller_load_async_start(Eo *obj);