Support motion JPEG

Describe the bug
I'm trying to use egui::Image::from_uri("http://localhost:1181/stream.mjpg") to show the image stream posted by a local mjpegserver, I can get the image stram through the browser and Postman, but it keeps showing big spinner inside my egui window.

My code is:

 Window::new("Stream")
            .id(Id::from(page_id.to_string()))
            .open(is_open)
            .resizable(true)
            .collapsible(true)
            .show(ctx, |ui| {
                install_image_loaders(ctx);
                ui.add(Image::from_uri("http://localhost:1181/stream.mjpg"));
            });

Expected behavior
The window should keeps showing the image stream in real time

Desktop (please complete the following information):

• OS: Windows 10 x86

Start by tracing Image::from_uri and install_image_loaders with the provided MJPEG URL, then inspect how the image stream is handled when the spinner remains visible. Reproduce the issue using the Windows example and verify completion when the egui window displays the image stream continuously in real time.