Make Vite plugin ask the resolver for the list of static assets and emit them one by one

[BlueCutOfficial]

https://github.com/embroider-build/embroider/blob/main/packages/vite/src/resolver.ts#L63 this needs to not be hard-coded

the new api should be just to enumerate all the things to resolve so it goes through the same code-path 👍

Implementing this will make it simpler to implement new bundlers because they will all just have to ask the resolver for the files to output and the resolver will be driving. It's probably best to do this before #2021