Feature request: "Match making"

[GuillaumeSalles]

Feature request from @CTNicholas

https://discord.com/channels/913109211746009108/913157273046646795/938057663055560764

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Another handy feature would be a room that automatically generates its own ID, and autofills up to a certain capacity. Once the current room is full, users start filling up a new room. This would be great for public facing pages; Next.js Conf had this feature, with random people's live cursors appearing on screen. It would also be handy for any games built on Liveblocks, as a matchmaking mechanic. Quick example:

  matchmaking="busiest"
  prefix="live-cursors-"
  maxUsers={20}
  onCreate={id => {
    // 'live-cursors-cwg3h46shkd4h4hjshs'
    console.log(id)
  }
/>

I've written matchmaking="busiest" because there could be multiple algorithms for filling the rooms.
Examples:
busiest: When all rooms are full, create a new room. The busiest room is then filled first.
emptiest: When all rooms are full, create a new room. The emptiest room is then filled first.

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[andreaselia]

It would definitely be cool to get some proper examples/functionality down for how to handle this sort of thing when using Liveblocks to create web games.