docs(ClickHouse): Add example

[digital88]

What does this PR do?

Add ClickHouse example to modules section in docs.

Why is it important?

ClickHouse module docs are missing.

How to test this PR

Simply run docker compose up and access the docs at: http://localhost:8000.

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[HofmeisterAn]

Thanks for the PR. I haven't merged it yet because there was another one open that changed the ClickHouse tests (it adds the ADO.NET wait strategy: #1401). We'll need to update the documentation for this, similar to what we did for the other modules, I think.

Honestly, I don't think our current setup is ideal. The tests are optimized for testing, but not really for documentation purposes. Maybe it would make sense to use separate classes just for the documentation in the future. The original idea was to reference real source code in the docs to make sure everything compiles. But that's something we can discuss and address in a separate issue/PR.

Thanks again.