[Feature] support ultravox

[zhyncs]

Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 2. Please use English, otherwise it will be closed.

Motivation

https://huggingface.co/fixie-ai/ultravox-v0_4

Related resources

No response

[github-actions]

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