Introduce a wayland/x11 mutter hints protocol for monitor labels #5565

Job	Run time
build-and-test (unstable)	1m 3s
fedora	1m 34s
build-and-test (stable)	56s
build-and-test (development-target)	59s
lint	12s
open-suse-leap	2m 6s
	6m 50s

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