orders: manage order status

[nmoutschen]

This change adds a new field to orders named "status", which is already part of the Order schema, and a new field called "history" containing the changes for the order over time.

The "status" field could have the following values:

• NEW
• PACKAGED
• PACKAGING_FAILED
• DELIVERY_FAILED
• FULFILLED

This should add the following capabilities:

• New orders should have a status field with the value "NEW".
• Changing the status to PACKAGED following a PackageCreated event from the warehouse service.
• Changing the status to FULFILLED following a DeliveryCompleted event from the delivery service.
• Changing the status to PACKAGING_FAILED following a PackagingFailed event from the warehouse service.
• Changing the status to DELIVERY_FAILED following a DeliveryFailed event from the delivery service.