Migrate friends service to new IPC (#6174)

* Migrate friends service to new IPC

* Add a note that the pointer buffer size and domain counts are wrong

* Wrong length

* Format whitespace

* PR feedback

* Fill in structs from PR feedback

* Missed that one

* Somehow forgot to save that one

* Fill in enums from PR review

* Language enum, NotificationTime

* Format whitespace

* Fix the warning

src/Ryujinx.Horizon/Sdk/Settings/System/AccountNotificationSettings.cs

@@ -0,0 +1,15 @@
+using Ryujinx.Horizon.Sdk.Account;
+
+namespace Ryujinx.Horizon.Sdk.Settings.System
+{
+    struct AccountNotificationSettings
+    {
+#pragma warning disable CS0649 // Field is never assigned to
+        public Uid UserId;
+        public uint Flags;
+        public byte FriendPresenceOverlayPermission;
+        public byte FriendInvitationOverlayPermission;
+        public ushort Reserved;
+#pragma warning restore CS0649
+    }
+}