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/Friends/InAppScreenName.cs

@@ -0,0 +1,26 @@
+using Ryujinx.Common.Memory;
+using Ryujinx.Horizon.Sdk.Settings;
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Ryujinx.Horizon.Sdk.Friends
+{
+    [StructLayout(LayoutKind.Sequential, Size = 0x48)]
+    struct InAppScreenName
+    {
+        public Array64<byte> Name;
+        public LanguageCode LanguageCode;
+
+        public override readonly string ToString()
+        {
+            int length = Name.AsSpan().IndexOf((byte)0);
+            if (length < 0)
+            {
+                length = 64;
+            }
+
+            return Encoding.UTF8.GetString(Name.AsSpan()[..length]);
+        }
+    }
+}