Add `next_array` and `collect_array` #983

Job	Run time
check format	7s
doc	7s
check	24s
check (--no-default-features)	7s
miri	2m 50s
msrv	1m 20s
semver-checks	10s
check (--no-default-features --features use_alloc)	8s
check (--all-targets --all-features)	18s
test	56s
All checks succeeded	1s
	6m 28s

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