general: Add desktop icons extension
As part of the classic experience desktop icons are still expected.
The main work will happen at https://gitlab.gnome.org/csoriano/org.gnome.desktop-icons, and I'll push here updates when they happen.
The extension is still in a quite early stage though, so maybe this is not ready for merge. It also requires Nautilus 3.29.91 (not released yet).
Edited by Carlos Soriano