Conversion scripts per model

### Feature Idea

I notice many repos on huggingface include the original model checkpoint and often a diffusers format version. Inside the diffusers library scripts/ folder are many convert_to_*.py scripts which will take the original checkpoints and produce a diffusers formatted version. This is useful to avoid storing multiple versions of the same model, just backup the original checkpoint and the conversion script gets you the diffusers format when you need it.

I presume the comfy team have internal scripts to convert either the original model checkpoint or diffusers depending on what was originally released, into comfyui format.

Any chance those scripts could be included in the comfy repo ?

### Existing Solutions

_No response_

### Other

_No response_

Start by reviewing the conversion scripts in Diffusers' scripts/ folder, especially the convert_to_*.py files, and inspect ComfyUI for any existing model-conversion entry points. Define which original or Diffusers checkpoints are supported and what ComfyUI output each conversion must produce before implementing per-model scripts.

Written by the indexing model from the issue text.