[ONNX] Loading textual inversion .bin/.pt embeddings

[GreenLandisaLie]

I tried to follow this guide: https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/stable_conceptualizer_inference.ipynb But OnnxRuntimeModel does not have any of the necessary functions that CLIPTextModel has and since I'm no dev I couldn't figure out how to get this working. If this is already possible then I guess this issue is just about the lack of documentation on this subject, else this is something that should be added eventually. Also, it would be cool if we could have a simple single function within the pipelines for this purpose.