Does `rls-analysis` support everything we need?

Upstream wants to work with us, but we haven't actually determined if we need anything yet.

This quest issue is both broad and specific. Someone wanting to close it out should:

1. Work through all of the different kinds of information that we need out of rls-analysis.
2. Inspect its API to figure out if it all exists or not.

If we don't have all of the stuff we need, we'll have to open issues with upstream and work with them to get the information landed.