Consider making IExcludeTypeValidationFilter a ModelMetadata setting

[rynowak]

There's lots of overlap here between ModelMetadata.IsSimpleType and what IExcludeTypeValidationFilter does in practice.

I suggest removing this interface as an extensibility point, and making it just a setting on ModelMetadata - something like:

public bool ValidateProperties { get; }

There's a few concrete benefits we get from putting it on MM:

• Caching
• Discoverability
• Better naming
• Removes an extensibility point and oft-neglected option

We can retain the existing functionality if we want by adding an extension method one-liner to configure a MM provider that will configure this for a type.

[ajaybhargavb]

@rynowak, looks like you already fixed this in 96de1db. Should this just be closed or is there more to this?

[rynowak]

Yeah, this is done. Ya snooze, ya looze.