cuda: add SET operation support (#16804)
* feat(cuda): add GGML_OP_SET support
Implement CUDA kernel for SET operation with f32 support.
All tests passing (14598/14598).
* cuda(set): add I32 support; keep F32
* refactor(cuda): use ggml_cuda_cpy to unify SET operator logic and remove code duplication
* Update ggml/src/ggml-cuda/ggml-cuda.cu
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* Update ggml/src/ggml-cuda/set.cu
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
