Trigger notifications after storage

[mathiaszinnen]

Currently, notifications are triggered after successful data transformations. This can lead to race conditions if a client waits for notification and instantly pulls the data. Instead, notifications should be triggered after successful data storage.
This entails two tasks:

• The storage-mq service needs to publish events to storagemq after data persistence.
• The notification service needs to listen for these events instead of transformation events (change the rabbitmq subscription)