Thanks + marigold model support

[luboslenco]

Hello there - I just wanted to say thanks for this amazing library! The amount of features already implemented now and growing is unbelievable.

I started to work on support for the marigold models which are used to extract depth / normals / material properties. I plan to open a proper PR, but it will likely take me some time to tidy it up as I am still learning. However, if anyone stumbles onto this via search, you should be able to already run these models via the fork at https://github.com/luboslenco/stable-diffusion.cpp.

Marigold models:
https://huggingface.co/prs-eth/marigold-depth-v1-1
https://huggingface.co/prs-eth/marigold-normals-v1-1
https://huggingface.co/prs-eth/marigold-iid-appearance-v1-1