Add astroturf support

[ai]

css-literal-loader is an amazing CSS-in-JS solution since it has zero runtime and compiles by Babel during deploy.

As result, it is blazing fast and 100% compatible with PostCSS ecosystem. This is why it is “official” CSS-in-JS for PostCSS 😄.

@gucong3000 I can send PR, but I am not sure how to write tests.

[ai]

@gucong3000 not it is called astroturf

[ai]

@gucong3000 ping