* Rename setProcessingResponse to setPaymentResult and remove setOrderId from the checkout data store actions
* Fix accidentally changing data exposed to the observers
* Rename all checkout actions with the __internal prefix
* Prefix all payment method data store actions with __internal
* Pedantic spacing
* Fix ts error
* Remove setPristine as it's not used
* Comment checkout actions
* Rename setProcessingResponse to setPaymentResult and remove setOrderId from the checkout data store actions
* Add comments to payment actions
* Update documentation with data stores
* Fix accidentally changing data exposed to the observers
* Document missing parameters for actions