Add caching

[kevinlinxc]

My trino queries take about a minute to complete.
Every time I load the Trino dashboard, click to a different dashboard and back to the Trino dashboard, the queries are run again, which is really slow and a bad user experience. I think instead, the old data should be cached and displayed while the data is being loaded.

This seems to be an option for other data sources:
https://grafana.com/blog/2021/09/02/reduce-costs-and-increase-performance-with-query-caching-in-grafana-cloud/