Checkout Block: Express Checkout Section - Edit Context

[nerrad]

Note: when working on this issue, please give due consideration to:

• Are there components that can be pulled from @wordpress/components (i.e. <Card>)?
• Are there components that can be pulled from @woocommerce/components?
• Are there components/logic that can be pulled from @automattic/components or @automattic/composite-checkout

We want to avoid duplication of work/logic already done elsewhere as much as possible.

As per the exploration done by @Aljullu in #1208 this issue is concerned with the Express checkout area of the checkout.

In context of entire view:

Express Checkout section:

Suggested Components

• ExpressCheckout (/base/components/checkout/express-checkout)
• ExpressCheckoutButton (/base/components/checkout/express-checkout-button)

Other

Also let's use this issue to add the "Or continue below" separator (base/components/separator)

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[nerrad]

This is completed with the merge of #1349 (remaining work covered by other issues).