R1:6933ee5fb86d

Don't spend ridiculous amounts of time rebuilding orderable columns

Summary:
Ref T8575. Because orderable columns need to build custom fields, they are relatively expensive to build. Use the request cache.

(The request cache is technically more correct than `static`, because configuration may change between requests and we may eventually reuse interpreters.)

Test Plan: Saw home page time drop 39% (from 462ms to 283ms).

Reviewers: btrahan, avivey

Reviewed By: avivey

Subscribers: avivey, epriestley…