[FEA]: Add efficient unstable thread sort

[Nyrio]

Is this a duplicate?

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Area

CUB

Is your feature request related to a problem? Please describe.

The thread sort currently only has a stable method, the odd-even transpose sorting network, which has a complexity O(N^2).

Describe the solution you'd like

Other sorting networks such as Batcher's odd-even mergesort and Parberry's pairwise sort scale much better, with a complexity O(N log^2(N)), so for instance at 16 items/thread they would be 2x faster, at 64 items/thread 4x faster.

The block merge sort has stable and unstable APIs which could select the appropriate thread sort accordingly.

Describe alternatives you've considered

No response

Additional context

No response