Support a guild trivia leaderboard

[MitchellAW]

Currently there is only a global leaderboard for trivia performance, it would be good to add a guild-only leaderboard command, that lists the top 5 performers in each category in that users guild.

[MitchellAW]

It seems that providing a solution for this cannot be done cleanly without applying for discord's privileged member intents. I could provide a guild leaderboard of every member that ever participated in trivia for a particular guild, but I have no way of guaranteeing whether a user is still in the guild or has left.