Add variant information to cart item display

[zetlen]

This issue is for the following packages:

[x] venia-concept
[ ] pwa-buildpack
[ ] peregrine
[ ] pwa-devdocs
[ ] upward-js
[ ] upward-spec

This issue is a:

[ ] Bug
[x] Feature suggestion
[ ] Documentation issue
[ ] Other (Please Specify)

Description

With the merging of #550 the storefront supports configurable products, but the cart item display doesn't reflect the chosen configuration:

As a shopper, I want to see my chosen configuration options in my cart, so I can keep track of what I'm purchasing.

@soumya-ashok has made a visual comp: https://magento.invisionapp.com/share/HNPBRBHP29D#/screens

[ericerway]

Assigned to @JStein92 - let's groom this in realtime based on your interested in taking it.

[ennostuurman]

hey @JStein92 I have created PR #582 for this . Understood from @ericerway that you'd been doing work for this already as well which I wasn't aware off. I definitely would like to compare our results or maybe we could even combine both?

[JStein92]

@ennostuurman oh shoot just saw your message - my PR is #588

I suppose @ericerway or whomever can decide what to do here. I'm fine with whatever!

[ericerway]

I'd love for @JStein92 to finish this out but get a quick review from @ennostuurman who appeared to show interest at the same time in an effort to work on a quick starter story. We'll find more "good first issue" stories for everyone -- good problem to have. Thanks!

[JStein92]

Ok, just pushed a prettier pass to #588 (whoops) - looking forward to a review :)