build

Refactor `ArraySubset` iterators (#7) #161

Job	Run time
clippy	35s
test	1m 26s
fmt	23s
build (stable, --features "")	48s
build (stable, --all-features)	1m 53s
build (stable, --no-default-features)	1m 1s
codecov	2m 11s
build (1.71, --features "")	47s
build (1.71, --all-features)	1m 58s
build (1.71, --no-default-features)	54s
build (beta, --features "")	28s
build (beta, --all-features)	1m 33s
build (beta, --no-default-features)	26s
build (nightly, --features "")	38s
build (nightly, --all-features)	1m 50s
build (nightly, --no-default-features)	47s
	17m 38s

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