Add don't sleep toggle to the control panel

Hi!

It would be very useful to have a “don’t sleep” directly in the control panel, more specifically it could be added to the energy saver menu. This would work just like the caffeine extension.

See status: Implement new Stay Awake toggle (!2507) · Merge requests · GNOME / gnome-shell · GitLab and Add a simple "Stay Awake" Quick toggle (#8611) · Issues · GNOME / gnome-shell · GitLab. I think it’s still blocked by having configurable quick settings.