make filter use foreign key config

If you have a table with a foreign key and a name column defined, it would be nice for the filter for that column in the filter to give you a dropdown showing the name values to select from--or at least let you type that in instead of knowing the id of the row in the foreign key.

(I am just putting this here because I thought of it, I didn't look to see if there is already a capability or something in the works. Just didn't want to forget.)

The issue names no files, tests, or entry points. Start by locating the filter handling and the foreign-key metadata used for table columns; done would mean a foreign-key filter can select a related name value or accept that name instead of requiring its ID, with the behavior covered by tests.

Written by the indexing model from the issue text.