[arenamaster] state restoration?

[xtuc]

Sometimes, when arenamaster restarts, it loses its state and currently running arenas.

Restore state from graghql

Crash arenamaster:

• [ ] docker restarts the service
• [ ] Broadcast through mq to know what is currently going on

[xtuc]

Closing in favor of https://github.com/ByteArena/bytearena/issues/198