[Fix] Fix reasoning content

[Yunnglin]

see #791

[gemini-code-assist]

Summary of Changes

Hello @Yunnglin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue related to the handling and display of reasoning content from model responses. It updates how message content is extracted and processed, specifically allowing for the exclusion of reasoning details when converting OpenAI chat choices. Additionally, it refactors how responses are handled in the tau_bench adapter and updates benchmark tests to reflect new model and streaming parameters.

Highlights

• Conditional Reasoning Content: This change ensures that reasoning content can be optionally excluded when processing OpenAI chat messages, providing more control over the output.
• Message Content Extraction: The method of extracting message content was updated from .content to .text in the BFCL benchmark generation, adapting to potential changes in message object structure.
• Tau Bench Adapter Refinement: The Tau Bench adapter was refined to directly utilize res.completion for message content, simplifying the handling of model responses.
• Benchmark Test Updates: Benchmark tests for BFCL and Tau Bench were updated to use a specific model (qwq-plus) and enable streaming, aligning with new testing requirements or model capabilities.

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[gemini-code-assist]

Code Review

This pull request primarily focuses on fixing how reasoning content is handled, by making its inclusion in model outputs optional. This is implemented by adding an include_reasoning flag to several utility functions. The changes also include refactoring how message content is accessed, switching from .content to the more robust .text property, which is a good improvement. Additionally, a bug in tau_bench_adapter.py is fixed to ensure a string is always returned, though this introduces a potential issue with message history that I've commented on. The test configurations have also been updated accordingly. Overall, these are good fixes that improve correctness and add flexibility.