Support the new Solar architecture

[arnavgarg1]

🚀 The feature, motivation and pitch

This model from Upstage is extremely strong for models that fit on a single GPU for training and inference! https://huggingface.co/upstage/solar-pro-preview-instruct. However, it does use a custom architecture solar which is based on Llama/Mistral but modifies the forward pass to add long range residual connections. It would be awesome to support this architecture natively out of the box!

Alternatives

No response

Additional context

Thank you so much for this awesome project :)