Add ClickHouse usage blueprint

What does this MR do and why?

Adds an initial draft for a ClickHouse usage architecture blueprint as part of the ClickHouse working group. This draft outlines the summary and goals for the blueprint and subsequent MRs will incorporate work from the WG members.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.