Add Meta SUT (8b instruct with and without llamaguard)

[skim9]

Adding Meta SUT for the Llama3.1 8B instruct model (with and without llamaguard) using HuggingFace.

• 8B: https://huggingface.co/meta-llama/Llama-3.1-8B-Instruct
• Llamaguard: https://huggingface.co/meta-llama/Llama-Guard-3-8B

poetry run modelbench benchmark -m 10 --sut llama-3.1-8b-instruct-lg-h

The llamguard implementation checks if the output is unsafe according to llamaguard 8b, and if it is, it returns a benign response of "I can't answer that. Can I help with something else?"

[github-actions]

MLCommons CLA bot:
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[wpietri]

Looks like this has gone stale without the CLA being signed, so I'm going to close this for now. Happy to reopen it if needed.