Refactor to add Stat Trackers

[sauravbanna]

Description

Refactors the stats module to add a trackers module, containing individual trackers, each responsible for tracking a specific part of the game state

This makes it more modular and easier to add more stats related logging in the future, as we can reuse the tracking logic in multiple places.

Testing Done

Compiles, and existing stats are tracked correctly

Resolved Issues

Length Justification and Key Files to Review

Review Checklist

It is the reviewers responsibility to also make sure every item here has been covered

• Function & Class comments: All function definitions (usually in the .h file) should have a javadoc style comment at the start of them. For examples, see the functions defined in thunderbots/software/geom. Similarly, all classes should have an associated Javadoc comment explaining the purpose of the class.
• Remove all commented out code
• Remove extra print statements: for example, those just used for testing
• Resolve all TODO's: All TODO (or similar) statements should either be completed or associated with a github issue