Implement endpoint for returning domain-specific status

[thomaseizinger]

Currently, there is no way too request configuration options from the API. It would be good to have an endpoint that returns stuff like:

• what is the current optimizer for new nobts
• whether the API is using an in-memory db or connected to a real database

Note that this is different from an actual healthcheck endpoint that would return information about the connected database. A healthcheck endpoint is out-of-scope of this issue.