docs: inline streaming event types in guide (follows #205)

[vrtnis]

This PR updates the Streaming guide to include inline documentation for the three event types emitted during streaming:

raw_model_stream_event

run_item_stream_event

agent_updated_stream_event

This aims to bring the JS SDK streaming docs in line with the Python SDK, which includes event references on the same page. It also fully resolves the request from #202, and complements the behavior fix in #205.

Screenshot shows output via pnpm docs:dev

Resolves #217

[changeset-bot]

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Latest commit: a81dfa8

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[seratch]

This is good addition! Another thing we may want to consider is to enrich the code comments to make the API reference document and have the links to them instead. It's be more accurate and up-to-date in the long run. That said, I don't oppose to have this change for now.