Add `next_array` and `collect_array` #1072

Job	Run time
doc	8s
check format	11s
check	7s
miri	3m 29s
check (--no-default-features)	11s
msrv	40s
check (--no-default-features --features use_alloc)	22s
semver-checks	2m 19s
check (--all-targets --all-features)	26s
test	53s
All checks succeeded	1s
	8m 47s

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