[e2e] Prepare steps for topic

[kshpilchyna]

create a separate Class with steps src/test/java/com/provectus/kafka/ui/steps/kafka (TopicSteps.java)

1. create steps such createTopic, deleteTopic, isTopicExist etc See tests that should be automated https://docs.google.com/spreadsheets/d/1Vf6yZSqCYwh33t-pTy1PiYewk-jFSfPZppzIuUVVyO0/edit#gid=0
2. Remove all sleeps, if needed to some wait, all asserts should be in test

Refactor test class src/test/java/com/provectus/kafka/ui/tests/TopicTests.java with new steps