Refactor: Decouples player view calculation from Server's Master

[vdfdev]

In this PR I refactor the interface between Master and Transport, so the Master will only send a single message to the transport, and then the transport will calculate the player view for each player.

This will allow us to use a pub/sub to propagate the Master message, allowing us to scale the bgio server horizontally.

Checklist

• Use a separate branch in your local repo (not main).
• Test coverage is 100% (or you have a story for why it's ok).

[delucis]

This looks like a good way to untangle these — good work!

We also need to account for the sync action, but otherwise this looks ready to go.

[vdfdev]

Comments addressed