Add support for tracking a Player's highest achieved global and country rank

[myssto]

Depends on #341

Because we have decided to do away with the idea of historical rank leaderboard data it has left a big feature gap in terms of rank statistics. While it is not a super high priority, a feasible compromise to this can be to mimic the way osu! stores a user's highest achieved global rank (we should also store country rank as there is no reason not to).

• [ ] #372
• [ ] #373
• [ ] Identify (and create / edit) relevant DTOs that should include this information
• [ ] Modify existing repository methods to include and map this data to the relevant outputs

[hburn7]

This will require the same processing power as the historical rank tracking, not sure I'm a fan.