feat(clickhouse): add list-databases tool

[pjhampton]

Description

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Adds a tool to the list databases in a clickhouse cluster

PR Checklist

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  bug/issue
  before writing your code! That way we can discuss the change, evaluate
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🛠️ Fixes #<issue_number_goes_here>

[pjhampton]

Hey @averikitsch - any feedback I can address to get this merged?

[averikitsch]

Hi @pjhampton, sorry for the delay. I will review this PR tomorrow. Thank you for your patience!