Use integer scaling for pixelart wallpapers

### Feature Description

Something like https://pypi.org/project/pyxelart-detector/ could be used to determine the appropriate scaling automatically, though I just did a cursory search and I have no idea if it's actually reliable.

Alternatively, an option to use integer scaling could be added in wallpaper settings, ideally remembered per-wallpaper. Even if the automatic detection is added, maybe a manual override could be nice too, just in case?

### Use Case

currently lower-resolution pixelart wallpapers render blurrily

exaggerated example

### Compositor(s)

All compositors

### If Other, please specify

_No response_

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

You can integer-upscale the image in an image editing program and use that image as a wallpaper.