Support Constructable Stylesheets (CSS Modules) in DOM Shim

[thescientist13]

Summary

Now that Import Attributes are a thing, including CSS Modules as Constructable Stylesheets, it would be good to get some basic support for this into the DOM Shim at least in some capacity.

Something at minimum like, that can shim part of the CSSStyleSheet class

class CSSStyleSheet {
  constructor() { }
  replace() { }
  replaceSync() { }
}

Details

This would help support projects like Greenwood in supporting features like being able to author using Import Attributes - #153