[Feature]: add support for third party stable cascade finetunes

[A500000]

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Feature description

This would add support for using my own stable cascade safetensors finetunes instead of the hf blobs currently being used

Version Platform Description

No response

[vladmandic]

you should be able to load any stable cascade finetunes as-is? copying @Disty0 for more info as he did a SC finetune himself.

[Disty0]

Load the Stable Cascade base (the decoder) from Huggingface as the main model first, then load a Unet (prior) as the Unet.

Put the Unet safetensors in Unet folder and put the text encoder (if you use one) in there too. Text encoder name should be the Unet Name + _text_encoder

Example Unet: sc_unet.safetensors Example TE: sc_unet_text_encoder.safetensors