Clickhouse support

[JohnTheLearner]

Please add official support for clickhouse (https://clickhouse.tech/). It's an open-source database that easily outperforms many other options for some uses in general, but specifically in the big data space.

Clickhouse is not expressly supported by many things including native sqlalchemy, but is supported reasonably well via the sqlalchemy-clickhouse module found over at https://github.com/cloudflare/sqlalchemy-clickhouse. As I've mentioned in other GH issues (#101 , #131 ), it does work somewhat well in jupyterlab-sql with a good combination of it and jupyterlab versions.