CartesianProduct medium #union

by jazelly @jazelly

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Given 2 sets (unions), return its Cartesian product in a set of tuples, e.g. ```ts CartesianProduct<1 | 2, 'a' | 'b'> // [1, 'a'] | [2, 'a'] | [1, 'b'] | [2, 'b'] ```
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