The CollectionQueryInfo class has several responsibles/serves several purposes:

• It contains information related to plan caching
• It contains path tracking logic used for updating indexes as a result of writes
• It contains logic to track collection index usage. 

While plan caching is owned by QO, the other two (path tracking/index stats) are owned by QE.

As such, this ticket proposes splitting up CollectionQueryInfo based on its responsibilities (and updating the ownership accordingly)