Support DataAnnotations and TagHelpers in WPF

I suggest that you allow using the attributes defined in System.ComponentModel.DataAnnotations with any property in a wpf project, like ASP.NET does. For example:
```C#
[Required]
[MinLength(2)]
[MaxLength(12)]
public string FirstName { get; set; }
```
ASP.NET generates server side validation code for these attributes (beside the client side validation scripts), so, I think you can make WPF borrow the class that generates the server side code to achieve this. Note: There are some attributes used with tag helpers to affect the UI such as DisplayAttribute. I think XAML should also add the tag helpers concept too. I find it easier and shorter than the currently used data binding.