Feature: Add support for file type icon overlay

### What's the Problem?

In Explorer, thumbnails have, or can be set to have, filtype-icons as overlays. This helps to discern a JPG from a PSD or afphoto etc. Also, videos and images or PDFs are hard to discern without any indication of the filetype.

In medium or large icon view, even the filenames are usually cut off so that the extensions are not visible, either.

### Solution/Idea

Have files show the filetype-icons as overlays the way Explorer does. (It is possible, that this is not native to explorer, but there is a setting in Sage Thumbs which leads to that kind of overlay)

### Alternatives

No alternative ideas

### Priorities

| Capability | Priority |
| :---------- | :------- |
| This proposal will allow end users to discern the filetype in thumbnail views | Must |

### Files Version

2.0.34.0

### Windows Version

Windows 10 Pro Version 21H1 Betriebssystembuild 19043.1348

### Comments

_No response_