feat: Add tool call support for models without native function call c…

[NeilJohnson0930]

Description

Add tool call support for models without native function call capability, such as Deepseek R1-series

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• [ ] I have read the CONTRIBUTION guide (required)
• [ ] I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #issue-number in the PR description (required)
• [ ] I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• [ ] I have updated the tests accordingly (required for a bug fix or a new feature)
• [ ] I have updated the documentation if needed:
• [ ] I have added examples if this is a new feature

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch dev_sglang

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