Add k6 for legacy async batch passthrough read operation

Add k6 for legacy async batch passthrough read operation

- add kafka support to k6 codebase
- add two new tests: data operation batch passthrough read
   and data operation async batch read (from kafka)
- calculate the events/second via Trend
- add kafka ui support to docker-compose

Note: Before this commit being merged, the k6 executable
should have been compiled with the kafka extension of xk6-kafka

Issue-ID: CPS-2268

Change-Id: Ib7777b7bc9f15b210ea36d3541cba0e0c943f883
Signed-off-by: halil.cakal <halil.cakal@est.tech>