Improve geometry APIs, to be closer to `euclid` #4837

Job	Run time
clippy-check	2m 0s
smithay-check-features	2m 41s
format	7s
check-msrv	1m 10s
smithay-tests	2m 38s
check-minimal	1m 5s
smallvil-check	57s
anvil-check-features	2m 4s
Documentation on Github Pages	1m 3s
WLCS: Core tests	1m 12s
WLCS: Output tests	1m 14s
WLCS: Pointer input tests	1m 3s
WLCS: Bad Buffer Test	1m 7s
	18m 21s

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