Cleaned up interfaces. Extracted server state machine trigger handler to seperated classes. Removed legacy code

MoonlightServers.Daemon/ServerSystem/Interfaces/IInstallation.cs

@@ -0,0 +1,50 @@
+namespace MoonlightServers.Daemon.ServerSystem.Interfaces;
+
+public interface IInstallation : IServerComponent
+{
+    /// <summary>
+    /// Checks if the installation environment exists. It doesn't matter if it is currently running or not
+    /// </summary>
+    /// <returns>True if it exists, False if it doesn't</returns>
+    public Task<bool> CheckExistsAsync();
+
+    /// <summary>
+    /// Creates the installation environment
+    /// </summary>
+    /// <param name="runtimePath">The host path of the runtime storage location</param>
+    /// <param name="hostPath">The host path of the installation file system</param>
+    /// <returns></returns>
+    public Task CreateAsync(string runtimePath, string hostPath);
+    
+    /// <summary>
+    /// Starts the installation
+    /// </summary>
+    /// <returns></returns>
+    public Task StartAsync();
+    
+    /// <summary>
+    /// Kills the current installation immediately
+    /// </summary>
+    /// <returns></returns>
+    public Task KillAsync();
+    
+    /// <summary>
+    /// Removes the installation. E.g. removes the docker container
+    /// </summary>
+    /// <returns></returns>
+    public Task DestroyAsync();
+    
+    /// <summary>
+    /// Subscribes to the event when the installation exists
+    /// </summary>
+    /// <param name="callback">The callback to invoke whenever the installation exists</param>
+    /// <returns>Subscription disposable to unsubscribe from the event</returns>
+    public Task<IAsyncDisposable> SubscribeExited(Func<int, Task> callback);
+    
+    /// <summary>
+    /// Connects an existing installation to this abstraction in order to restore it.
+    /// E.g. fetching the container id and using it for exit events
+    /// </summary>
+    /// <returns></returns>
+    public Task RestoreAsync();
+}