Track high scores for each server the bot is in

[benslv]

No description provided.

[benslv]

Adding extra info to this ticket for when I get to it.

Basically want to have a "global leaderboard" where each server competes with each other to have the highest possible count.

Perhaps two different leaderboards: one tracking highest count ever reached in every server, and one for the current count in each server.

Also could look into generating the stats every 5 minutes and pulling from something static, rather then every single time the command is run, to reduce load.