Authoritative Client Server Sandbox

Things to investigate

• Investigate code generation to implement Send And Receive
• Investigate contained data types to reduce boilerplate in Receive code. For example:

  public struct ClientHeartBeatData
  {
    public MessageTypeId MessageTypeId => MessageTypeId.ClientHeartBeat;
    public float clientTimeSec;
  }
  
  [MemoryPackable]
  public partial struct ClientHeartBeat : IMessage
  {
    public ClientHeartBeatData data;
  }```

• Investigate code generation to implement MemoryPackable from plain structs.