Add a high-level interface to the runtime's bundling facilities

[rdw-software]

This is mostly to provide end users with a standardized and easy-to-understand API. The functionality should mostly be there, though it has some weird behaviors (mainly with "folder bundles") which can get in the way and might need to be altered down the line.

See also: https://github.com/nexe/nexe and https://github.com/vercel/pkg - as well as lit.