Import Attributes syntax parsing

[thescientist13]

Summary

In conjunction with #152 and ProjectEvergreen/greenwood#923, it would be great to get the needed support in for Import Attributes syntax into WCC's parser.

import data from './data.json' with { type: 'json' }
import sheet from './styles.css' with { type: 'css' }

Details

This will require pulling in some additional acorn plugins to help out with the parsing for the time being.