llama : optimize vocabulary loading (#30679)
* llama : optimize vocabulary loading
* Update src/unicode.h
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* CR : added reserve in gguf_kv_to_str
* CR : trailing space fix
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
