Support non-Vec data structures in relations #56300

Job	Run time
miri	12m 55s
ci	3m 16s
toml	2m 0s
build (windows-latest)	10m 57s
check-bevy-internal-imports	4s
check-doc	10m 27s
build (ubuntu-latest)	6m 48s
check-missing-examples-in-docs	44s
build (macos-latest)	5m 50s
run-examples-macos-metal	5m 3s
typos	6s
check-missing-features-in-docs	31s
markdownlint	1m 4s
check-compiles-no-std	1m 42s
check-compiles	4m 59s
build-wasm-atomics	1m 30s
build-wasm	51s
msrv	1m 52s
	1h 10m 39s

Provide feedback