implement autosharding #789
Description
The officially hosted version of Monty has hit 2k guilds. It is now time to implement sharding. Sharding is required at 2.5k guilds, and we need to be prepared. It will likely be a long time before that 2.5k guild count is hit, but never say never.
Considerations for scaling and sharding should be taken into account for the future in order to have downtimeless updates, but that's not a major concern right now.