R1:7f91c8c4acbb

Rebuild the bulk editor on SearchEngine

Summary:
Depends on D18805. Ref T13025. Fixes T10268.

Instead of using a list of IDs for the bulk editor, power it with SearchEngine queries. This gives us the full power of SearchEngine and lets us use a query key instead of a list of 20,000 IDs to avoid issues with URL lengths.

Also, split it into a base `BulkEngine` and per-application subclasses. This moves us toward T10005 and universal support for bulk operations.

Also:

- Renames most of "batch" to…