Implement Sync for ArrayParts #560

Job	Run time
Pass MSRV values to other jobs	2s
clippy/stable	23s
miri	10m 53s
nostd/thumbv6m-none-eabi/stable	16s
cargo-careful	1m 49s
cross_test/i686-unknown-linux-gnu/stable	1m 54s
cross_test/s390x-unknown-linux-gnu/stable	8m 5s
format/nightly	14s
docs/nightly	21s
tests/stable	2m 23s
tests/beta	2m 24s
tests/1.64.0	3m 31s
tests/nightly	2m 34s
blas-msrv	53s
conclusion	3s
	35m 45s

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