Add Clone, PartialEq, Ser/De traits to Parent/Children #36874

Job	Run time
build (windows-latest)	7m 0s
ci	3m 9s
toml	4s
build (ubuntu-latest)	3m 10s
check-bevy-internal-imports	9s
build (macos-latest)	9m 23s
check-doc	8m 3s
check-missing-examples-in-docs	38s
miri	7m 33s
run-examples-on-windows-dx12	15m 43s
check-missing-features-in-docs	34s
markdownlint	1m 9s
check-compiles	4m 21s
msrv	1m 42s
build-wasm	1m 35s
	1h 4m 13s

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