feature: Use a Set to check for uniqueness in Array

[aarontravass]

Description

The current @ArrayUnique uses a filter based method to compare objects. This is an O(n^2) solutions. The JS spec for Set states that

The specification requires sets to be implemented "that, on average, provide access times that are sublinear on the number of elements in the collection". Therefore, it could be represented internally as a hash table (with O(1) lookup), a search tree (with O(log(N)) lookup), or any other data structure, as long as the complexity is better than O(N).

Hence, I believe it would be more performant to use a Set based approach to check for uniqueness.

Proposed solution

Something as simple as

Array.from(new Set(inputArray)).length == inputArray.length

[braaar]

I'm moving this to the discussion tab, as we are trying to keep the issue count low. Please see this issue for an explanation.