Share fixed-width structural array operations #6619

Job	Run time
Python (wheel build)	6m 17s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=30573584092/runner=arm64-medium/imag...	2m 6s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=30573584092/runner=amd64-medium/image...	1m 22s
Rust publish dry-run	56s
Compat check / compat-test	4m 7s
	14m 48s

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