mtmd: support dots3-note vision+audio (#27524)
* text: conversion
* init impl
* mtmd: conversion
* impl mtmd cpp
* Update gguf-py/gguf/tensor_mapping.py
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>
