Add sdk error extension

[jezekra1]

Summary

Linked Issues

Ref: #1489

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @jezekra1, 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 significantly enhances the SDK's error handling capabilities by introducing a dedicated ErrorExtension. This extension provides a standardized mechanism for agents to report exceptions, ensuring that errors are presented clearly and consistently in the user interface. It also includes new VSCode configurations to streamline the development workflow for contributors.

Highlights

• New Error Extension: Introduced a new ErrorExtension to standardize error reporting from agents to the UI, providing a consistent and user-friendly display of exceptions.
• Automatic Error Handling: The SDK now automatically catches exceptions raised within agent functions and uses the ErrorExtension to format and report them, requiring no explicit configuration for basic error reporting.
• Customizable Error Reporting: Agents can inject and configure the ErrorExtensionServer to include stack traces in error messages, which is useful for debugging but can be disabled for production environments.
• Enhanced Developer Experience: Added new VSCode workspace and settings files across various project components to improve consistency and setup for developers, including Python interpreter paths, analysis modes, and recommended extensions.
• Example and Documentation: A new example agent (error_agent.py) demonstrates the usage of the ErrorExtension, and comprehensive documentation has been added to guide users on error handling.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable SDK error extension, which standardizes error handling and reporting for agents. The implementation is robust, including automatic handling of exceptions, configurable stack trace inclusion, and support for exception groups. The addition of an example agent, comprehensive tests, and documentation is excellent. My review includes a few minor suggestions to improve code formatting and simplify some logic for better readability and maintainability.