feat: add support for processing only production (non-dev) package info

[ptmkenny]

This is a really exciting project. I have an app I'm building in TypeScript that has a ton of dependencies, and I'm very interesting in reducing them/optimizing as much as possible... in my production app. For my dev dependencies, I don't care nearly as much.

For such use cases, it would be great if there was an option to consider only the production dependencies and to ignore everything about the dev dependencies.

I have no idea how difficult that would be to implement, but for people whose goal is to reduce bundle size and duplication in production code, being able to ignore the dev dependencies would be helpful.

[43081j]

i think this is a good idea, a new --production flag or some such thing.

we could then just scan dependencies instead (and one day, core-js imports)