Add `next_array` and `collect_array` #969

Job	Run time
check format	13s
check	7s
doc	7s
check (--no-default-features)	22s
test	49s
msrv	37s
check (--no-default-features --features use_alloc)	9s
check (--all-targets --all-features)	22s
semver-checks	33s
All checks succeeded	0s
	3m 19s

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