Replace grace period manager with a saga

[MarcinHoppe]

• Store data on incoming UserCheckoutAcceptedIntegrationEvent and publish event to trigger saga
• Add timeout in saga and upon receiving timeout, publish GracePeriodConfirmedIntegrationEvent
• Receive OrderStockRejectedIntegrationEventHandler inside saga
• Receive CancelOrderCommand inside saga
• Process OrderStockConfirmedIntegrationEvent correctly. Not 100% sure on how this works
• Check any other events that seem like infrastructural events, might need to replace these with business events. It's either cancelled or not.

Finally this should work

• Happy path where orders are simply successfully ordered
• Path where orders are canceled by user
• Path where orders are canceled because we're out of stock
• Path where payment isn't successful.
• Clean up
• Tests