Document from_clickhouse

[mavam]

🔍 Problem

• The ClickHouse docs only covered writing to ClickHouse.
• The new from_clickhouse operator needs reference and guide coverage.
• The ClickHouse docs should also describe the shared database-operator connection contract, including URI-based connections.
• The ClickHouse integration diagram should live as editable Excalidraw source in the docs repo.

🛠️ Solution

• Add a dedicated from_clickhouse operator reference page.
• Update the ClickHouse integration page and related data-store guides for read and write workflows.
• Document both connection styles for ClickHouse operators:
  • explicit host / port / user / password
  • uri="clickhouse://[user[:password]@]host[:port][/database]"
• Clarify that database.table and URI/default databases replace a separate database argument.
• Cross-link related operator and integration pages.
• Replace the tracked ClickHouse SVG with a raw .excalidraw source file that the docs build converts automatically.

💬 Review

• Focus on whether the guide split between collecting from data stores and routing to data-store destinations is clear.
• Confirm the ClickHouse integration page tells a coherent read/write story around from_clickhouse and to_clickhouse.
• Check that the URI guidance and examples are consistent across the reference and guide pages.

_{🛠️ Code PR: tenzir/tenzir#6048
🎫 Refs TNZ-403}

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