[Feature] Why not support vision model quantilization?

### Motivation

Set internvl as an example, it's vision model is 6B. If the vision model can be quantilized, the inference process can be done in only one 4090.
请问目前vision model不支持量化的原因，是因为feature暂时还没有去做，还是因为目前使用的awq对于vision model量化的实现效果不太好吗

### Related resources

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### Additional context

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