Implement streaming task system plan

[sroussey]

Implement a streaming task system to allow tasks to provide incremental output updates, improving responsiveness and user experience for long-running operations.

This PR introduces core streaming types and interfaces, extends Dataflow and TaskGraphRunner to manage streaming data and task execution, and updates the DependencyBasedScheduler to handle streaming task dependencies. It also includes utility functions and type guards for easier streaming integration. The design ensures backward compatibility, making streaming an opt-in feature.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

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