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[r/LocalLLaMA] ggml : add NVFP4 quantization type support

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Summary

The `ggml` library, used by `llama.cpp`, now supports NVIDIA's NVFP4 quantization format, available in recent versions. This update introduces `GGML_TYPE_NVFP4`, enabling efficient local inference of models quantized using NVIDIA ModelOpt's specific FP4 E2M1 weights and UE4M3 per-block scale. This enhancement improves compatibility and potentially performance for users running these optimized models locally.

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