llama: fix llama-model-saver (#20503)
* llama : add fd-based model loading via llama_model_load_from_fd
* llama : address review feedback for fd-based model loading
* llama : use FILE pointer instead of fd in public API
* llama : use FILE pointer consistently, address review feedback
* fixup
* fix tensor names
* fix llama-model-saver
* roundtrip tests
* fixup
* refactor tests
* fix prints
* fix model saving
* fix CI, disable Chameleon
* print seed
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Co-authored-by: Siddhesh2377 <siddheshsonar2377@gmail.com>
