* Add migration marking existing columns as materialized with a comment
* Add method to allow looking up materialized columns
* Add test for fetching and creating materialized columns
* Disable caching in tests
* Remove some callsites to CLICKHOUSE_DENORMALIZED_PROPERTIES
* Fixup caching logic
* Add (currently broken) test for denormalizing person properties
* Update funnel event query to work with new functionality
* Update other tests/queries
* Remove now-unused setting
