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Description
Is your feature request related to a problem? Please describe.
Recently, session lock support was merged into gtk4-layer-shell. It'd be nice if Astal supported it directly without having to manually upgrade regular windows
Describe the solution you'd like
A window implementation for the gtk4-layer-shell session lock API.
Describe alternatives you've considered
Manually making regular Gtk.Windows and using the gtk4-layer-shell session lock API on them
Additional context
There is no full release with the session lock API yet. So this probably needs to wait until one is created. 1.1.0 was released which includes this functionality