Make views queryable #3483
Description
Specifically from the sql http api. We're not concerned with subscriptions or the websocket api for this ticket. The http call does not have to read the materialized table. It is enough for it to invoke __call_view__ and return the result. We do not have to be concerned about arguments in this ticket either. Calling parameterized views can be implemented separately.
Note, this requires the query engine to be able to call into the module.