Support custom data types

(this might probably be a dupe)
**Is your feature request related to a problem? Please describe.**
Be able to understand and use custom data types https://www.postgresql.org/docs/current/sql-createtype.html

**Describe the solution you'd like**
Be able to use the custom data types in GUI questions and filters

**Describe alternatives you've considered**
Make a view that explodes this data type to a base type

**How important is this feature to you?**
NA

**Additional context**
NA

Start with PostgreSQL's CREATE TYPE behavior and how Metabase currently exposes database types to GUI questions and filters. Define the supported custom-type cases and verify that they can be used in both questions and filters; the issue names no files or tests, so the relevant entry points must first be located.

Written by the indexing model from the issue text.