Implemented first iteration of the docker-based server installer. Added restore functionality for the installer. Wired up for basic installer testing

MoonlightServers.Daemon/ServerSys/Abstractions/IInstaller.cs

@@ -5,6 +5,7 @@ public interface IInstaller : IServerComponent
     public IAsyncObservable<object> OnExited { get; }
     public bool IsRunning { get; }
     
+    public Task Setup();
     public Task Start();
     public Task Abort();
     public Task Cleanup();