Add Statistic support to PortModules

[feldergast]

Please describe the new features with any relevant use cases.
Add support for Statistics to the PortModule API

Describe the proposed solution you plan to implement
The Statistics created in PortModules will be mapped to the Component of the port that the PortModule is attached to. We will map PortModule stats into the same namespace so that the various enableStatitics calls will work.

Testing plan
Will add tests to the statistics test suite.

Additional context
The PortModule base class has a BaseComponent* to the component that it is being attached to. This will allow the PortModule to map its stats into the (Sub)Component.