Treat Groups as Extras

[jaymegordo]

Great to see this feature is now available, thanks. Also great that this neatly generalizes the dev-dependencies in a compatible way :-)

I've read through the documentation, and am left with a few questions:

1. After reading this section, I wonder: What's the difference between poetry install --default and a plain poetry install? Does the former install only dependencies, and the latter also the package itself? Or is there another reason for --default to exist?
2. How do dependency groups interact with extras? From the docs, it seems that these two features now coexist but are completely separate? Wouldn't it be possible to also integrate these? Essentially, AFAICS, extras are just optional dependency groups, so it would be nice if they could be treated (and specified) as such? That would mean that --with and --extras become essentially the same option (--extras could be deprecated maybe), and extras could be specified using the new dependency group syntax (and the [tool.poetry.extras] section and optional attribute on individual dependencies could also become deprecated, I think). I might be missing some subtle differences that prevent this, though?

Originally posted by @matthijskooijman in #1644 (comment)

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