Add `next_array` and `collect_array` #966

Job	Run time
doc	7s
check	11s
check (--no-default-features)	9s
check format	6s
check (--no-default-features --features use_alloc)	10s
msrv	35s
semver-checks	15s
check (--all-targets --all-features)	20s
test	59s
All checks succeeded	1s
	2m 53s

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