Spin-up dedicated pod for using `kafka-console-consumer.sh`

[piotrpdev]

Executing scripts on Kafka pods is discouraged. We should spin-up a dedicated pod instead of using:

kubectl exec -it my-cluster-dual-role-0 -n flink -- /bin/bash \
  ./bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic flink.sales.records

Mentioned by Jakub in: #71 (comment)