metal : reusing llama.cpp logging (#3152)
* metal : reusing llama.cpp logging
* cmake : build fix
* metal : logging callback
* metal : logging va_args memory fix
* metal : minor cleanup
* metal : setting function like logging macro to capital letters
* llama.cpp : trailing whitespace fix
* ggml : log level enum used by llama
* Makefile : cleanup ggml-metal recipe
* ggml : ggml_log_callback typedef
* ggml : minor
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
