Allow enforcing clickhouse settings on explore queries

[tanner-bruce]

Some things that could be helpful to force at the explore query level

https://clickhouse.com/docs/en/operations/settings/settings#force_index_by_date

https://clickhouse.com/docs/en/operations/settings/settings#force-primary-key

https://clickhouse.com/docs/en/operations/settings/settings#force_data_skipping_indices

[SpencerTorres]

This is an interesting idea, and not the first time I've seen people requesting the ability to control SETTINGS on the query builder. (Example #520 (comment))

If you want, we can continue this as a feature request on the issues board. Feel free to submit an issue with an idea for how you would want this to be controlled via the UI or datasource config