Add work around for NativeAOT bug with enums and DefaultValues

Enums are converted to integers with NativeAOT on attribute constructors. This work around is needed until that bug is fixed. See dotnet/runtime#100688

examples/Cli/Demo/Verbosity.cs

@@ -37,6 +37,13 @@ public VerbosityConverter()
 
     public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
     {
+        // NativeAOT will pass an integer when using the DefaultValue and an enum, so we need to manually convert
+        // that back to the enum
+        if (value is int intValue && Enum.IsDefined(typeof(Verbosity), intValue))
+        {
+            return (Verbosity)intValue;
+        }
+
         if (value is string stringValue)
         {
             var result = _lookup.TryGetValue(stringValue, out var verbosity);