Feature Request: Enum support

[commonspider]

Problem

Mathesar doesn't support enums. A workaround is to create tables and connect them with a foreign key, however this pollutes the list of tables a lot and makes exports less readable.

Proposed solution

Please make Mathesar support enums. I would like to see a dropdown menu in the cells of the columns with an enum type. I don't really need much else since I can manage the rest with psql.
Thanks!