llava : introduce libmtmd (#12849)
* wip llava2
* migrated gemma3 to llava2
* add timings
* correct pre/postfix
* fix missing include
* fix compilation unused var warn
* update llava2_tokenize
* change name llava2 --> mtmd
* improve api
* refine helpers
* Update examples/llava/mtmd.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
