[TENE-330] Check that the application is properly connected to Kafka
Changed actuator behavior for endpoint /health, now shows more detailed data, including kafka status information. Added a simple checker to see if a kafka is available. Created an additional topic, to which test messages fly, if any exception occurs along the way, healthIndicator will intercept it and return the error itself and the status DOWN, in the opposite case UP status will be returned
Closes TENE-330