Add `next_array` and `collect_array` #965

Job	Run time
check format	13s
doc	6s
semver-checks	2m 22s
check	8s
test	48s
check (--no-default-features)	14s
msrv	1m 16s
check (--no-default-features --features use_alloc)	7s
check (--all-targets --all-features)	19s
All checks succeeded	1s
	5m 34s

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