[FEAT] Move `@daffodil/cart` checkout code to `@daffodil/checkout`

[griest024]

:bulb: Feature request

Feature Name

Move @daffodil/cart checkout code to @daffodil/checkout

The Desired Behavior

Some fields on cart are really more part of checkout and don't really belong on cart. DaffCart should be a collection of cart items and some totals and discounts. Shipping and billing address, shipping method, and payment are not needed for that purpose and should be moved to checkout.

Your Use Case

As an app dev, I don't want to load unnecessary code on my homepage when I load the cart module.

[griest024]

blocked by #2751