Add documentation for streaming events
What does this MR do and why?
- Adds some basic documentation to explain how/why to use streaming events and in what circumstances that events are streamed. This is just a start, as we implement streaming-only events we'll expand this section with instructions on how to enable it.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #344668 (closed)