Make MarkupExtension.ProvideValue method inlinable for StaticResourceExtension and ResolveByNameExtension

[maxkatz6]

What does the pull request do?

There is no XAML magic in this PR, just making extensions implementation easier to digest for JIT compiler.
With .NET 9 optimizations, extension object allocation can be eliminated, if it's simple enough for JIT compiler.
I was able to confirm it with Disasmo #17622 (comment)
These changes didn't really improve our existing benchmarks to a measurable degree. Likely because we lazily evaluate most of static resources in our themes.

What is the current behavior?

{StaticResource} object can't be inlined by JIT.

What is the updated/expected behavior with this PR?

{StaticResource} object can be inlined by JIT.

How was the solution implemented (if it's not obvious)?

Moves complex implementation details to a static stateless method, which we forcefully don't inline. Making instance extension method as simple, as possible (just a simple single call), allowing JIT to eliminate instance object creation completely.
Note: this improvement is in effect only with .NET 9 target.

Example of affected code:

public static object Build_664(IServiceProvider P_0)
{
    var context = CreateContext(P_0);
    SolidColorBrush solidColorBrush;
    SolidColorBrush result = (solidColorBrush = new SolidColorBrush());
    context.PushParent(solidColorBrush);
    StaticResourceExtension staticResourceExtension = new StaticResourceExtension("SystemAltHighColor");
    context.ProvideTargetProperty = SolidColorBrush.ColorProperty;
    object? obj = staticResourceExtension.ProvideValue(context);
    context.ProvideTargetProperty = null;
    XamlDynamicSetter_21(solidColorBrush, obj);
    context.PopParent();
    return result;
}

And generated assembly code (.NET 9). Left 11.2.2, right this PR.
Notable changes:

1. CORINFO_HELP_NEWSFAST and object allocation is removed.
2. Before const string key (0xD1FFAB1E) was assigned during object creation, after const string key is directly passed to the static method as a parameter.
   

[maxkatz6]

Side note. We should return to the idea of resolving some static resources compile time, if referenced resource is defined in the same file.

[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0053649-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[MrJul]

Awesome! :)