Implement summary.arePermutations()

[Smoren]

True if iterables are permutations of each other.

function *arePermutations<T>(...iterables: Array<Iterable<T> | Iterator<T>>): boolean

PHP implementation example

Needs to be implemented:

• summary.arePermutations()
• summary.arePermutationsAsync()
• Stream.arePermutations()
• AsyncStream.arePermutations()