Run the style transform in Webpack for development and visual regression

[NicholasBoll]

🚀 Feature Proposal

Add the style transformer to webpack so we can verify everything is working in development and in visual regression.

Motivation

There's not really a way to know the CSS class names or if the style transform is working correctly in Storybook. The scariest is lack of visual regression. We should verify the transform is working in visual regression rather than relying on our users to report visual regression issues.