@winzou Are we missing `OrderPaymentTransitions::GRAPH`?

Also should we use state machine in `StateResolver`?

https://github.com/Sylius/Sylius/blob/1f76020d41f7f5dd1e96a59eb88fe6756d58dbd3/src/Sylius/Component/Core/OrderProcessing/StateResolver.php#L28-L31

Or even better, we can remove these `StateResolver` and rely on the events triggered by state machine.