feat(transform): add generic streaming support

[steebchen]

Summary

• Adds support for streaming function call deltas with generic handling of various naming conventions
• Enhances transformStreamingToOpenai to transform function call delta events into OpenAI chat completion chunk format

Changes

Core Functionality

• Added new case handling for function call delta events including:
  • response.function_call.delta
  • response.function_call_arguments.delta
  • response.function_call_arguments.appended
• Extracts function call name, call ID, and arguments text from multiple possible fields to support varied data structures
• Constructs transformed data with assistant role and tool call details formatted for OpenAI streaming response compatibility

Test plan

• Verify streaming responses with function call deltas are correctly transformed and emitted
• Test with different function call delta event types and data shapes to ensure robust handling
• Confirm no regressions in existing streaming transformations for other event types

🌿 Generated by Terry

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

📎 Task: https://www.terragonlabs.com/task/d938aaf5-6337-4608-91e4-118952ddee51

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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/add-function-call-streaming-support

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