[ark-multiplayer-kit] Integrate ecs functions into multiplayer

[ryanpeh]

Changes

Goal of this PR is to revise how multiplayer works
Current implementation: Events between peers to are synced
Intended new implementation:

• Having a central device (master device) to maintain the state of the game.
• Events will be sent from the slave devices to the master device, which will determine which ecs functions are required to run.
• Master device will then broadcast the functions ( basically pseudo state deltas) to the rest of the devices.

Things done

• Implement multiplayer ECS system.
• Update multiplayer manager to integrate multiplayer ECS
  • Implement ecs delegate functions
  • Implement ecs function serialiser
• Implementation of role determining mechanism into multiplayer manager
• Modification of existing events multiplayer implementation to support new networking requirements
• Address serializing issue - Kind of resolved but not really
• Make existing components sendable (SendableComponent)
• Test and make sure everything works (with exceptions in comments)

[didymental]

think we don't need to integrate multiplayer context.

dev can define multiplayer via blueprint.supportNetworkPlay(roomName, numberOfPlayers) instead of through context

[didymental]

testing-wise, should be good except for exceptions in #80

• audio (not yet integrated)
• host close/ disconnected from session
• player-level screen resize

[didymental]

lgtm