Support sass loader

In projects created by create-react-app with default settings, all that is required for importing sass is to install node-sass. The project automatically understands to add the sass loader, enabling import "./myFile.scss" syntax.

In create-react-app --scripts-version=react-scripts-ts, users are required to add another layer of file watchers, adding unnecessary complexity.

Please update webpack config in the generator to load any scss files with the sass loader, just as it currently does with css files and just ass the default generator does with scss files.