feat(gpu): implement shuffle

[enzodimaria]

This PR contains

the new feature FHE bitonic_sort:

• Inputs: a mutable slice of CudaUnsignedRadixCiphertext (or signed)
• Outputs: the same slice, sorted in ascending order (in-place)

Goal:

• Shuffle a list in numerical order (e.g., cards, participants, orders) without revealing the final order.
• Ensure fairness in applications.

Benchmarks:

| Parameter Set                      | Elements | Execution Time (Median) |
|------------------------------------|----------|-------------------------|
| unchecked_bitonic_sort (multibit)  | 8        | 224.19 ms               |
| unchecked_bitonic_sort (multibit)  | 16       | 683.26 ms               |
| unchecked_bitonic_sort (multibit)  | 32       | 1.9839 s                |
| unchecked_bitonic_sort (multibit)  | 64       | 5.4894 s                |
|------------------------------------|----------|-------------------------|
| unchecked_bitonic_sort (classical) | 8        | 265.90 ms               |
| unchecked_bitonic_sort (classical) | 16       | 698.71 ms               |
| unchecked_bitonic_sort (classical) | 32       | 1.8683 s                |
| unchecked_bitonic_sort (classical) | 64       | 4.9841 s                |

1 x H100-SXM5

[andrei-stoian-zama]

Should the API work with GpuFheXYArray ?