Implement Sync for ArrayParts #558

Job	Run time
clippy/stable	29s
Pass MSRV values to other jobs	3s
cross_test/i686-unknown-linux-gnu/stable	2m 48s
docs/nightly	23s
miri	10m 40s
nostd/thumbv6m-none-eabi/stable	26s
cross_test/s390x-unknown-linux-gnu/stable	8m 41s
cargo-careful	2m 3s
format/nightly	14s
blas-msrv	42s
tests/nightly	3m 2s
tests/stable	2m 42s
tests/1.64.0	2m 47s
tests/beta	2m 39s
conclusion	0s
	37m 39s

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