Add mistral small

[AndrewMead10]

Context

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• add a new feature
• fix a bug
• update tests and/or documentation
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Changelog

What are the changes made in this PR?

• Added mistral small (24B) model builders

Test plan

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[pytorch-bot]

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[ebsmothers]

Thanks @AndrewMead10 for the PR! Overall this looks good to me, just one minor comment. Do you also want to add some configs under recipes/configs/mistral for folks to use this model?

[ebsmothers]

I think this should be 100M, not 10M? Ref (And similar comment in the other builders)

[joecummings]

Can we actually move this to it's own section and own folder? Mistral Small (even though it's the same architecture) is a different model and under a different release.