feat(streaming): include function_call

[steebchen]

Summary

• Enhances the transformStreamingToOpenai function to include function call details in the delta object when present in streaming responses
• Ensures the function_call object with name and arguments is serialized and added to the delta
• Improves compatibility with OpenAI streaming response format by accurately reflecting function calls in the transformed data

Changes

Core Functionality

• Extracts parts from the first candidate's content
• Checks for presence of function calls within parts
• Constructs a delta object with role "assistant" and conditionally adds a function_call field
• The function_call field includes the function name and JSON-stringified arguments
• Updates the transformedData choices to use the new delta object instead of a static role-only delta

Test plan

• Verify that streaming responses with function calls include the function_call object in the delta
• Confirm that responses without function calls remain unchanged
• Test integration with downstream consumers expecting function_call in delta
• Ensure no regressions in handling finish reasons and other response fields

🌿 Generated by Terry

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ℹ️ Tag @terragon-labs to ask questions and address PR feedback

📎 Task: https://www.terragonlabs.com/task/47fa8651-661c-44a8-8529-d385c70578a9

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch terragon/include-function-call-in-delta

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