Use data plane REST API for topic operations

[wtrocki]

Follow up with what UI uses.

This issue should automatically resolve #180 and #177

There are pending changes upstream which will see a REST API become available for performing CRUD on topics.

Once that is available, the CLI should use this API for the topics commands.

Pending changes: strimzi/strimzi-admin#6

[craicoverflow]

Did some investigation and this is blocked by pending changes upstream. Will pick it up again next week.

[craicoverflow]

OpenAPI schema PR to strimzi-ui is available here: https://github.com/Redhat-AppServices/strimzi-ui/pull/35/files