System - Add user monitoring features for repository admins

[dvstans]

There is a need for repository admins to be able to not only set/adjust allocations, but to also review the data access/transfer activities of specific users related to a managed repository. This will required logging certain user actions in the central DB and providing admin-only interfaces to view these logs.

[dvstans]

Change to Epic - this feature will require invasive changes to many parts of the system and require thorough analysis to determine what needs to be captured/monitored.

[JoshuaSBrown]

Logging and metrics are important to production. Our logging approach across the project probably needs to be standardized and documented.