Implement declaration rollups

[rdmurphy]

https://api-extractor.com/pages/setup/configure_rollup/

[rdmurphy]

Really trying to keep this from needing a real tsconfig.json so if I can figure that out we may be golden. 🤔

[rdmurphy]

Due to a fix in rollup-plugin-dts there may be a much, much easier way to pull this off. 🙌

[rdmurphy]

Added in 0.6.0.