fix: non streaming message agents

[tomkis]

Summary

Support to handle non-streaming agents via Message.

Linked Issues

Fixes #1877

Documentation

• No Docs Needed:

Fixes a bug in how non-streaming is handled.

[gemini-code-assist]

Summary of Changes

Hello @tomkis, 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 resolves an issue where non-streaming agent messages were not being properly processed. It enhances the client-side message handling to correctly interpret and display responses from agents that do not stream their output, ensuring a consistent user experience regardless of the agent's streaming capabilities.

Highlights

• Non-Streaming Message Handling: Introduced a new case within the event processing logic to specifically handle messages of kind: 'message'. This ensures that non-streaming agent responses are correctly parsed, their task IDs resolved, and their metadata and content parts are combined and emitted.

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[gemini-code-assist]

Code Review

This pull request adds support for non-streaming agents by handling the message event. The implementation correctly processes message parts and forwards them. My main feedback is regarding the logic for determining the task ID, which falls back to using the message ID. This could be a bit confusing and has potential side effects. I've added a specific comment with a suggestion to improve clarity by adding a comment.