vault API: Rename bundle types and use SWHIDs to identify objects
This is to match changes in the vault interface, see swh-vault!121 (closed) for the rationale.
All existing queries still work, through "fallback" views. There are some minor changes in returned fields (removed obj_type, and replace obj_id with swhid), but I don't think anyone used them (since that info is already available to them before they send the request).
Test Plan
Tests will fail until swh-vault!121 (closed) is released.
Migrated from D6113 (view on Phabricator)