add `array_permutations()` #1079

Job	Run time
miri	3m 26s
doc	9s
check format	4s
check	16s
msrv	36s
check (--no-default-features)	19s
semver-checks	22s
check (--no-default-features --features use_alloc)	9s
test	57s
check (--all-targets --all-features)	19s
All checks succeeded	1s
	6m 38s

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