fix(AudioSwitcher): Fix switching audio device on Windows 11 with "Also foreground app"

Add missing methods for CSWinRT to be able to interact with the AudioPolicyClient

Fixes #802

Author: Belphemur

SoundSwitch.Audio.Manager/Interop/Client/Extended/Factory/AudioPolicyConfigFactory.cs

@@ -9,16 +9,20 @@ internal static class AudioPolicyConfigFactory
 
         public static IAudioPolicyConfig Create()
         {
-            if (Environment.OSVersion.Version.Major < 10)
+            return Com.Threading.ComThread.Invoke<IAudioPolicyConfig>(() =>
             {
-                return new UnsupportedAudioPolicyConfig();
-            }
-            if (Environment.OSVersion.Version.Build >= OS_21H2_VERSION)
-            {
-                return new Post21H2AudioPolicyConfig();
-            }
+                if (Environment.OSVersion.Version.Major < 10)
+                {
+                    return new UnsupportedAudioPolicyConfig();
+                }
+
+                if (Environment.OSVersion.Version.Build >= OS_21H2_VERSION)
+                {
+                    return new Post21H2AudioPolicyConfig();
+                }
 
-            return new Pre21H2AudioPolicyConfig();
+                return new Pre21H2AudioPolicyConfig();
+            });
         }
     }
 }

SoundSwitch.Audio.Manager/Interop/Interface/Policy/Extended/IAudioPolicyConfigFactoryNative.cs

@@ -10,6 +10,10 @@ namespace SoundSwitch.Audio.Manager.Interop.Interface.Policy.Extended
     [ComImport]
     public interface IAudioPolicyConfigFactoryVariant21H2Windows11
     {
+        void GetIids(out int iidCount, out IntPtr iids);
+        void GetRuntimeClassName(out IntPtr className);
+        void GetTrustLevel(out WinRT.TrustLevel trustLevel);
+
         int __incomplete__add_CtxVolumeChange();
         int __incomplete__remove_CtxVolumeChanged();
         int __incomplete__add_RingerVibrateStateChanged();