Mark BindableIReadOnlyListAdapterComWrappersMarshallerAttribute as obsolete

Added Obsolete and EditorBrowsable attributes to BindableIReadOnlyListAdapterComWrappersMarshallerAttribute to indicate it is deprecated and should not be used in new code.

Author: Sergio0694

src/WinRT.Runtime2/ABI/WindowsRuntime.InteropServices/Bindables/IBindableIReadOnlyListAdapter.cs

@@ -2,8 +2,10 @@
 // Licensed under the MIT License.
 
 using System;
+using System.ComponentModel;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using WindowsRuntime;
 using WindowsRuntime.InteropServices;
 using WindowsRuntime.InteropServices.Marshalling;
 using static System.Runtime.InteropServices.ComWrappers;
@@ -85,6 +87,10 @@ static BindableIReadOnlyListAdapterInterfaceEntriesImpl()
 /// <summary>
 /// A custom <see cref="WindowsRuntimeComWrappersMarshallerAttribute"/> implementation for <see cref="BindableIReadOnlyListAdapter"/>.
 /// </summary>
+[Obsolete(WindowsRuntimeConstants.PrivateImplementationDetailObsoleteMessage,
+    DiagnosticId = WindowsRuntimeConstants.PrivateImplementationDetailObsoleteDiagnosticId,
+    UrlFormat = WindowsRuntimeConstants.CsWinRTDiagnosticsUrlFormat)]
+[EditorBrowsable(EditorBrowsableState.Never)]
 public sealed unsafe class BindableIReadOnlyListAdapterComWrappersMarshallerAttribute : WindowsRuntimeComWrappersMarshallerAttribute
 {
     /// <inheritdoc/>