Add chat template support for llama-cli (#8068)
* add chat template support for llama-cli
* add help message
* server: simplify format_chat
* more consistent naming
* improve
* add llama_chat_format_example
* fix server
* code style
* code style
* Update examples/main/main.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
