Add Model loading from subfolders similar to transformers

[philschmid]

Feature request

Transformers is adding support for loading models from subfolders: https://github.com/huggingface/transformers/pull/18184

from transformers import BertModel
BertModel.from_pretrained("fusing/latent-diffusion-text2im-large", revision="d5eab56", subfolder="bert")

Motivation

Makes it easier to manage optimized models in existing repositories

Your contribution

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