Implement editable shipping address for Checkout

[ericerway]

This issue is for the following packages:

[X] venia-concept
[ ] pwa-buildpack
[ ] peregrine
[ ] pwa-module
[ ] pwa-devdocs

This issue is a:

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

Environment

Question	Answer
Magento version
Operating System + version
node.js version (node -v)
npm version (npm -v)

Description

As a shopper, I want to use an actual address for shipment when making a purchase on Venia so that I can complete my order across multiple countries.

Expected result:

Updates to address (shipping) in checkout using form field components; stored in GraphQL
Basic validation of form fields (and error/success messages) appear visibly
Ability for form fields to be styled (best practices)
Browser level auto-complete functionality; accessible labels and roles
Required fields and formatting (as noted)
Test and documentation (as appropriate)

Possible solutions: