allow script to build output as well

[pelikhan]

Allow JS to contribute to final markdown text.

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• New OutputTrace interface introduced for logging various types of messages.
• Existing ToolCallTrace interface updated to include more method signatures.
• Integration of new envoutput.genai.mjs file, which uses the output trace builder to log a heading before generating text with a template literal.
• Significant changes rearranged the order and grouping of tab panels in the App.tsx component, placing the "Output" tab below "Messages." This likely enhances the user experience by logically organizing the output-related content.

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[github-actions]

LGTM 🚀

The pull request contains significant updates to the types and interfaces related to trace logging. The new OutputTrace interface provides a comprehensive set of methods for logging various types of messages, which enhances the flexibility and functionality of the logging system.

The renaming and refactoring of existing interfaces are well-structured, making it easier to understand the purpose of each method and improving code readability. The addition of detailed descriptions for each method in JSDoc comments also improves documentation and makes intention clearer.

Overall, the changes improve the robustness and maintainability of the logging system, and I see no functional issues in the provided diff.

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