feat(anthropic): enable thinking

[suluyana]

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[gemini-code-assist]

Summary of Changes

Hello @suluyana, 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 introduces a significant enhancement for Anthropic LLMs by enabling the exposure of their internal 'thinking' process during generation. The core change involves modifying the API call parameters to activate this thinking mode and updating the streaming message processing to correctly capture and expose this reasoning content separately from the main output. This aims to provide greater transparency into the model's decision-making and problem-solving steps.

Highlights

• Anthropic Thinking Feature: Implemented support for Anthropic's 'thinking' capability, allowing the model to generate internal reasoning steps that can be streamed and captured.
• Streaming Thinking Content: Enhanced the streaming output handler to differentiate and capture 'thinking_delta' content, storing it in a new reasoning_content field within the message object.
• Configuration for Thinking: Introduced enable_thinking and thinking_budget parameters, accessible via extra_body, to control the activation and token allocation for the thinking feature in Anthropic API calls.
• Test Coverage: Added a new test case (test_stream_agent_multi_round_with_thinking) to validate the functionality of streaming thinking content, including assertions for the presence of reasoning_content.

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[gemini-code-assist]

Code Review

This pull request adds support for Anthropic's "thinking" feature, which enables streaming of intermediate reasoning steps from the model. The implementation correctly handles new streaming events and populates the reasoning_content in the Message object. The tests are also updated to cover this new functionality. I have a few suggestions for improvement, including preventing unnecessary data from being sent to the Anthropic API, a note of caution about a significant increase in the default max_tokens, and a comment on reduced test coverage from a removed test. Overall, this is a valuable feature addition.