Add a gizmo-based overlay to show UI node outlines #31929

Job	Run time
build (windows-latest)	7m 39s
ci	3m 4s
build (ubuntu-latest)	2m 33s
miri	5m 59s
build (macos-latest)	8m 22s
run-examples-on-windows-dx12	26m 41s
check-bevy-internal-imports	5s
check-doc	6m 52s
check-missing-examples-in-docs	50s
check-missing-features-in-docs	46s
markdownlint	1m 13s
check-compiles	6m 1s
build-wasm	1m 30s
msrv	53s
	1h 12m 28s

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