Implemented restorer, wired up for basic testing. Improved abstractions and fixed observer pattern issues

MoonlightServers.Daemon/ServerSys/Implementations/DockerInstaller.cs

@@ -0,0 +1,55 @@
+using System.Reactive.Linq;
+using System.Reactive.Subjects;
+using MoonlightServers.Daemon.ServerSys.Abstractions;
+
+namespace MoonlightServers.Daemon.ServerSys.Implementations;
+
+public class DockerInstaller : IInstaller
+{
+    public IObservable<object> OnExited => OnExitedSubject;
+    public bool IsRunning { get; private set; } = false;
+    
+    private readonly Subject<string> OnExitedSubject = new();
+    
+    private readonly ILogger<DockerInstaller> Logger;
+
+    public DockerInstaller(ILogger<DockerInstaller> logger)
+    {
+        Logger = logger;
+    }
+
+    public Task Initialize()
+    {
+        return Task.CompletedTask;
+    }
+
+    public Task Sync()
+    {
+        throw new NotImplementedException();
+    }
+    
+    public Task Start()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task Abort()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task Cleanup()
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task<ServerCrash?> SearchForCrash()
+    {
+        throw new NotImplementedException();
+    }
+    
+    public async ValueTask DisposeAsync()
+    {
+        OnExitedSubject.Dispose();
+    }
+}