Replace grace period manager with a saga

[MarcinHoppe]

• [x] Store data on incoming UserCheckoutAcceptedIntegrationEvent and publish event to trigger saga
• [x] Add timeout in saga and upon receiving timeout, publish GracePeriodConfirmedIntegrationEvent
• [x] Receive OrderStockRejectedIntegrationEventHandler inside saga
• [x] Receive CancelOrderCommand inside saga
• [x] Process OrderStockConfirmedIntegrationEvent correctly. Not 100% sure on how this works
• [x] 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

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