llama : add grok-1 support (#6204)
* Add support for Grok model architecture
* Revert convert-hf-to-gguf to default options
* Fixed f_norm_rms_eps bug
* Fix whitespaces
* llama : fix grok rope type
* llama : minor
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
