Further improvements to the Cart/Checkout data flow

[alexflorisca]

This issue is used to track a list of potential improvements that came out of the [Data Store Migration Project] (#6612). These are to be worked on after the feature branch is merged to trunk

• Move default-states into their respective data stores #6626
• useEmitResponse is not a react hook, it just exposes so... #6611
• Document and rename all actions in the checkout, payment and validation stores as internal #7248
• Rename payment-methods data store to payment #7244
• Potential issue with displaying errors from StoreAPI #7021
• Refactor payment-methods context to be consistent with checkout-events context #6999
• Optimise payment method checking #6656
• Remove EnteredAddress type in favour of Address type #6627
• checkPaymentMethodsCanPay executed too many times #7031
• Investigate if we can avoid subscribing to entire store changes of wc/store/cart #6630
• Create tests for filterEnabledCustomerPaymentMethods #6629
• Work out which data store actions we want to expose for third parties #7250
• If any action on a data store is used with the wrong type, we should show an error to the console #7249
• Payment details not updated between failed attempts woocommerce-gateway-stripe#2472
• convert usePaymentMethods & useExpressPaymentMethods into payment methods data selectors #6665
• Revisit payment status logic  #7040
• Option to only trigger canMakePayment on change event #7309
• Use register instead of registerStore from wpData #7032
• Refactor payment status [after data store work is merged] #6998
• Investigate if we can replace useCheckoutAddress hook with direct interactions with wc/store/checkout #6581
• Move check-payment-methods.ts and set-default-payment-methods.ts into thunks #6654
• In the checkout store, rename either the action SET_SHIPPING_ADDRESS_AS_BILLING_ADDRESS or the state variable useShippingAsBilling to better reflect the connection between the two
• Remove CustomerDataContext  #6108
• Gutenberg with Thunks was released in WP 6.0. #6610

[alexflorisca]

All the tasks on here are done or decided not to do them, closing