Initial commit of new UI c# component

Il2CppInspector.Redux.GUI/UiProcessService.cs

@@ -0,0 +1,32 @@
+using System.Diagnostics;
+
+namespace Il2CppInspector.Redux.GUI;
+
+public class UiProcessService(IHostApplicationLifetime lifetime) : BackgroundService
+{
+    private const string UiExecutableName = "Il2CppInspector.Redux.GUI.UI.exe";
+
+    private Process? _uiProcess;
+
+    public void LaunchUiProcess(int port)
+    {
+        _uiProcess = Process.Start(new ProcessStartInfo(UiExecutableName, [port.ToString()]));
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        while (_uiProcess == null)
+            await Task.Delay(TimeSpan.FromMilliseconds(10), stoppingToken);
+
+        await _uiProcess.WaitForExitAsync(stoppingToken);
+        lifetime.StopApplication();
+    }
+
+    public override Task StopAsync(CancellationToken cancellationToken)
+    {
+        if (_uiProcess is { HasExited: false }) 
+            _uiProcess.Kill();
+
+        return base.StopAsync(cancellationToken);
+    }
+}