Add primary-selection filter #4894

Job	Run time
smithay-check-features	3m 1s
clippy-check	2m 28s
format	14s
smallvil-check	50s
check-minimal	1m 13s
check-msrv	1m 15s
smithay-tests	2m 23s
anvil-check-features	2m 44s
Documentation on Github Pages	1m 12s
WLCS: Core tests	1m 19s
WLCS: Output tests	1m 9s
WLCS: Pointer input tests	1m 10s
WLCS: Bad Buffer Test	1m 8s
	20m 6s

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