[FR] Add Gtk.ColumnView to owlkettle widgets
It seems that [Gtk.ColumnView](https://docs.gtk.org/gtk4/class.ColumnView.html) is the widget i need for the application i'm currently building, and future similar applications. 

I need to list a seq of objects in horizontal rows with each object field's data in a column with a header, and i need sorting and eventually filtering. It sounds like this is what ColumnView was made for. 

thanks