Add GGUF for Mamba

[VladOS95-cyber]

What does this PR do?

Add GGUF support for Mamba

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline, Pull Request section?
• [x] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case. Link: https://github.com/huggingface/transformers/issues/33260
• [x] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [x] Did you write any new necessary tests?

Who can review?

Regarding the task @SunMarc @LysandreJik @ArthurZucker.

[VladOS95-cyber]

Hi @SunMarc! This PR is ready for review, please, take a look.

[VladOS95-cyber]

Hey @SunMarc! Do you have any questions or comments regarding this PR?