Add moderator to matchups

It would be great to add a moderator to a pool in the matchups section of Heartbeat. We think this could help us personalize the experience for everyone. Let's say we create a random group of members in the matchups section, if we add a moderator they will know who is grouped, and also they could join their conversations. The idea of this is to automatically share a matchup with a specific moderator, this way we can have moderators work on that specific task, and we can assign different moderators to different pools in the Matchups section.