llama : refactor llama_model_quantize_params to expose a pure C interface (#20346)
* Refactor llama_model_quantize_params to expose a pure C interface
* Restore comment and cleanup struct def
* Code review refactoring
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Code review refactoring
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>