metal : add GGML_OP_TOP_K_MASK (#31230)
* metal : add GGML_OP_TOP_K_MASK
Port the fused top-k mask from the CUDA backend: a grid-stride kernel fills the output with -inf, then one
threadgroup per row copies the mask values of the kept cells over it. Function constants drop the score,
blocks and extra paths that a given graph does not use.
Assisted-by: dsh:llama.cpp/ggml-org/Qwen3.8-Flash-Next-GGUF (MacBook, M5 Max, 128GB)
* metal : clean up top-k mask kernel formatting
Assisted-by: dsh:llama.cpp/ggml-org/Qwen3.8-Flash-Next-GGUF (MacBook, M5 Max, 128GB)
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