Convert checkout context to data store - part 2

[alexflorisca]

Whilst working on moving the CheckoutState context into a data store, I came across an event emitter system that we are using only for the checkout. I was going to replace this with the new checkout data store as part of the Convert checkout context to data store PR, but I decided against it as it would be too big of a change, affecting critical parts of the block.

This issue is a continuation of the work done inside the PR mentioned above. More specifically, we'd need to

• These types are very similar to the status state variable. See if we can use the same status and incorporate these in.
• Replace event observers with selectors
• Replace event emitters with actions
• Move some of the logic in the checkout-state/index.ts into thunks within the checkout data store

[github-actions]

This issue has been marked as stale because it has not seen any activity within the past 60 days. Our team uses this tool to help surface issues for review. If you are the author of the issue there's no need to comment as it will be looked at.

Internal: After 10 days with no activity this issue will be automatically be closed.