Add redis store instead of badgerDB

[lordvidex]

• All game actions are stored in redis
• During reload, there is no need to dump or load hub data
• When game is fetched, redis is checked and is able to load full game data so that users can continue when there's downtime.

Closes: #32

[lordvidex]

Note that this pull request contains an hybrid store instead of relying on ONLY redis. This is because redis sorted sets does not provide adequate support for the custom ranking strategy.
Also, redis can have downtimes and this would not affect user's gameplay.