Control timeout in SuperSet

[dmosesson]

Bug description

We are trying to extend the query timeout for clickhouse queries beyond 5 minutes, but setting GUNICORN_TIMEOUT, SUPERSET_WEBSERVER_TIMEOUT has no effect, and setting timeout or connection_timeout in the SQLALCHEMY_ENGINE_OPTIONS via the UI gives an error: property is unknown or readonly

Screenshots/recordings

No response

Superset version

master / latest-dev

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.