Hunyuan I2V Guidance Scale and Negative Prompt

### Feature Idea

I posted this with Kijai as well (https://github.com/kijai/ComfyUI-HunyuanVideoWrapper/issues/439), but the main repo script for Hunyuan I2V has guidance_scale and negative prompt exposed as well, which greatly improves the video quality if you set guidance instead and leave embedded at 1 (so using true CFG). It doesn't seem to work to just connect the CFG or negative nodes to the Hunyuan I2V workflow though, so it'd be great if that functionality could be implemented. Or if it's already possible, please let me know what the correct way to go about it is. Thanks

### Existing Solutions

_No response_

### Other

_No response_