[OrderRefactor][Checkout] Fulfill Checkout Information - Address Selection

[nashtech-huyphamphu]

API

Implement an API to allow buyers to select their billing and shipping address IDs. The selected addresses should be validated before being saved to the checkout object.

UI

Modify the checkout flow so that users are required to create and save their shipping and billing addresses before selecting them during checkout. Currently, these addresses are only created after the "Proceed to Payment" button is clicked. This change should allow users to create and select their addresses in during the checkout process before moving forward.

We should also adjust the UI to match with the address selection API.