Test scaling to ½ billion works

[jonasob]

Over time, the catalog should scale to be able to include upwards of ½ billion works, and quite a bit of work may be needed to get us there. We can look at this in a few different stages:

• 50M works
• 100M
• 250M
• 500M

We need to scale both mongodb and the hashdb, while retaining lookup speeds on both. Approaches to scale could include ripping auth/frontend work from the catalog to create a lookup-only endpoint API, which is more lightweight than the r/w endpoint API.