Add support for Mistral-7B in the Completions API

[Yi Xu]

Feature Request

What is the problem you're currently running into?
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Add Mistral-7B to LLM Engine.

Why do you want this feature?
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https://mistral.ai/news/announcing-mistral-7b/

Benchmarks seem impressive:

Describe the solution you'd like
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Mistral-7B should appear in the model zoo.

Describe alternatives you've considered
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N/A

Additional context
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Prioritization

• Does this feature block you from using the project?

  • Yes
  • No

• How many users will benefit from this feature?

  • Just me
  • Few people might benefit
  • Many users will love it!

• Complexity

  • I believe it's a simple feature to implement
  • It might require some effort to implement
  • It's probably complex, and might take significant effort

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Thank you for your contribution to llm-engine. Please ensure you've given the feature considerable thought before submitting it. Once your feature request is accepted, and you're interested in building it, please mention it so that the maintainers can guide you!

[Yi Xu]

Just need a vLLM version bump, see vllm-project/vllm#1199

[Ian Macleod]

This is now done. Users can send Completion calls to mistral-7b and mistral-7b-instruct. See #307 for implementation!