lbl: Migrate service to Horizon (#5628)

* lbl: Migrate service to Horizon

* Fix formatting

* Addresses gdkchan's feedback

* Fix comments

src/Ryujinx.Horizon/Lbl/LblMain.cs

@@ -0,0 +1,17 @@
+namespace Ryujinx.Horizon.Lbl
+{
+    class LblMain : IService
+    {
+        public static void Main(ServiceTable serviceTable)
+        {
+            LblIpcServer ipcServer = new();
+
+            ipcServer.Initialize();
+
+            serviceTable.SignalServiceReady();
+
+            ipcServer.ServiceRequests();
+            ipcServer.Shutdown();
+        }
+    }
+}