Statistics + Leaderboards tracking

[ashhhleyyy]

Things to be done for statistics in general

• Fix Proper handling of different statistic types when quering #14
• Frontend
• Leaderboards!

Things that need to be done for leaderboards:

• Backend implementation
• API routes
• Frontend page

Current things to think about for implementing leaderboards:

• Should leaderboards update in fixed intervals (eg. update every 5 minutes), when statistics are submitted, or just be generated when a request is made?
  I would think that a fixed interval would be best, as at request time could be a performance issue, and when statistics are submitted may be too frequent and potentially cause performance issues/repeated regenerations in a short amount of time.
• How should leaderboards be managed?
  My current idea is to store them in a repo similar to game configs, using JSON files to define the styling and behavior of ranking calculation.