wayland: add prefer_csd attribute#4361
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This PR adds a new prefer_csd attribute that allows applications to indicate to the Wayland compositor that they prefer client-side decorations (CSD).
With this change:
If the compositor supports CSD, sctk-adwaita will be used to draw a frame around the window.
This happens not only when the compositor lacks server-side decorations (like in GNOME), but also whenever the compositor allows client-side decorations.
In combination with #4357, this enables creating windows with a frame but without a titlebar—making it possible to implement fully custom titlebars or headerbars while still retaining a proper window frame.
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