Make Scheduler import in IntelliJ

[cdegroot]

Scheduler currently doesn't work well with IntelliJ. See https://youtrack.jetbrains.com/issue/SCL-10768

We should see whether this is due to our sbt setup, maybe simplify it, check whether there are restrictions in multi-module setups, etcetera. Worst case, we may even have to check in project info (which is portable these days, so not as bad as it used to be).

[cdegroot]

(PD internal linked Jira ticket: CORE-996)