Rework achievement and quest data processing

[builder-247]

Currently quest and achievement data is handled inefficiently, causing extra delay to requests and stress on the internal network.

Scope of the refactor:

1. Move quests and achievements to their own MongoDB collections

   • Make a script migrating the DB(?)

2. The /players/:id endpoint no longer needs to wait for promise from parseAchievements since total achievement points are now included in the Hypixel API

Some relevant parts of code:

https://github.com/slothpixel/core/blob/master/routes/spec.js#L256-L266

https://github.com/slothpixel/core/blob/master/processors/processPlayerData.js#L131-L136