Add overview search actions

[JosiahFu]

I tend to use the overview search to suspend/shutdown more often than the quick settings menu, so it would be nice to have the hibernate options there as well.

[ViBE-HU]

this would be great. like shutdown, restart, logout.

[slaclau]

This is out of scope of the extension but can be achieved easily by adding files like this to /usr/share/applications or ~/.local/share/applications

[Desktop Entry]
Type=Application
Name=hibernate
Icon=application-exit-symbolic
Exec=systemctl hibernate