mtmd_image_tokens
* mtmd : add more api around mtmd_image_tokens * mtmd : ability to calc image hash * shared_ptr for mtmd_image_tokens * move hash to user-define ID (fixed) * fix prompt_modified * rm redundant data member
* 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> --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>