Replace PostgreSQL-connection to kafka

[SimonFrauenschuh]

Currently, PostgreSQL functions as the connector between the WebApp and the controlling unit. While this approach is practicable for storing the balls position, it isn't for steering the device via the mobile phone.

So switch to a message pus, use a Pub/Sub pattern with Kafka as the message broker.
To abstract the logic of receiving/writing the events, use dapr.

Also storing the data during the control-cycle should be done in an extra thread