Add gguf support for StableLM
Author: VladOS95-cyber
Pull request: yes

# What does this PR do?
Add GGUF support for StableLM
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## Who can review?
Regarding the task @SunMarc @LysandreJik @ArthurZucker .

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Comments:
Hi @SunMarc! This PR is ready for review, please, take a look.

Hey! 🤗 Thanks for your contribution to the `transformers` library!

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Hey @SunMarc! I resolved all comments, you could take a look again

> Thanks for iterating ! Could you also add a test to check the weights of each layer for the fp16 model, to see if we get the same model ? We recently merged the gguf falcon model and he added a nice test for that. Also there are a few merge conflits, thanks !

Hey @SunMarc! Sure, it is done

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33793). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Hi @LysandreJik! Just a kind reminder to take a look on this PR!