Add type aliases for higher-dimensional ArcArrays (#1561) #571

Job	Run time
format/nightly	13s
Pass MSRV values to other jobs	3s
docs/nightly	20s
miri	10m 41s
clippy/stable	12s
cargo-careful	2m 2s
cross_test/s390x-unknown-linux-gnu/stable	8m 59s
nostd/thumbv6m-none-eabi/stable	13s
cross_test/i686-unknown-linux-gnu/stable	1m 56s
blas-msrv	39s
tests/stable	2m 19s
tests/1.64.0	3m 26s
tests/nightly	3m 8s
tests/beta	2m 39s
conclusion	2s
	36m 52s

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