[XamlC] Prioritize compiled markup extensions over primitive types

[simonrozsival]

Description of Change

Fixes the following build error:

Issues\Maui20616.xaml(7,10): XamlC XC0103 error : Consider attributing the markup extension "Microsoft.Maui.Controls.Xaml.TypeExtension" with [RequireService] or [AcceptEmptyServiceProvider] if it doesn't require any. [D:\a\_work\1\s\src\Controls\tests\Xaml.UnitTests\Controls.Xaml.UnitTests.csproj]

The x:Type markup extension wasn't compiled because it was recognized as IsXaml2009LanguagePrimitive. With this change, XamlC will first check if the markup extension provides a compiled variant.

Compare the output for this sample XAML:

<ContentPage.Resources>
    <x:Type x:Key="mainPage">local:MainPage</x:Type>
</ContentPage.Resources>

// decompiled IL
-TypeExtension typeExtension = new TypeExtension();
-typeExtension.TypeName = "local:MainPage";
-XamlServiceProvider xamlServiceProvider = new XamlServiceProvider();
-Type typeFromHandle = typeof(IProvideValueTarget);
-object[] array = new object[0 + 1];
-array[0] = mainPage;
-object obj;
-xamlServiceProvider.Add(typeFromHandle, obj = new SimpleValueTargetProvider(array, typeof(VisualElement).GetRuntimeProperty("Resources"), new NameScope[2] { nameScope, nameScope }, false));
-xamlServiceProvider.Add(typeof(IReferenceProvider), obj);
-Type typeFromHandle2 = typeof(IXamlTypeResolver);
-XmlNamespaceResolver xmlNamespaceResolver = new XmlNamespaceResolver();
-xmlNamespaceResolver.Add("", "http://schemas.microsoft.com/dotnet/2021/maui");
-xmlNamespaceResolver.Add("x", "http://schemas.microsoft.com/winfx/2009/xaml");
-xmlNamespaceResolver.Add("local", "clr-namespace:MyMauiApp;Assembly=MyMauiApp");
-xamlServiceProvider.Add(typeFromHandle2, new XamlTypeResolver(xmlNamespaceResolver, typeof(MainPage).Assembly));
-xamlServiceProvider.Add(typeof(IXmlLineInfoProvider), new XmlLineInfoProvider(new XmlLineInfo(7, 10)));
-Type type = ((IMarkupExtension<Type>)typeExtension).ProvideValue((IServiceProvider)xamlServiceProvider);
+Type type = typeof(MainPage);
 mainPage.Resources.Add("mainPage", type);

/cc @StephaneDelcroix @rmarinho