SPIKE: Replace wc-sass-render with rollup plugin

[blackfalcon]

Is your feature request related to a problem? Please describe.

The current process for using Sass with Lit Element web components requires the use of a npm package wc-sass-render. This project is mostly abandoned and feels like an unnecessary risk to perpetuate its use.

Describe the solution you'd like

There is a more wildly used rollup solution we can use

https://www.npmjs.com/package/rollup-plugin-postcss-lit

Describe alternatives you've considered

Fork wc-sass-render and take ownership, but that feels unnecessary.

Additional context

This issue will be considered closed once we have evaluated the rollup solution and proposed the next steps either to adopt this tech and deprecate dependency on wc-sass-render or continue to use wc-sass-render.

[Patrick-Daly-AA]

Capping this spike at 3 earth days after we start on it.