[client] add ability to list topic names which exist on the server

There is no way to list the topics available to be read

Pubsub and kafka libraries (ex. sarama) have this feature

The issue names no source file or test. Start by locating the Go client entry point for topic metadata and the server request needed to enumerate topics, using the Sarama comparison as context. Done means the client can return the topic names available on the server and covers the new behavior with tests.

Written by the indexing model from the issue text.