Allow us to easily get a mapping of topics to brokers

A clear and concise description of what the enhancement is.
We need to have a quick way to figure out which topics are served by which brokers. So it will be helpful if if get broker URL and list of its partitioned topics which it serves from topic name

**Describe the solution you'd like**
Will use partitioned-lookup of the topic and sort them by broker URL

**Describe alternatives you've considered**
Partitioned -lookup of a topic helps but in other way that mapping of topic name and its broker URL.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by examining the existing partitioned-lookup entry point described in the issue and how it returns broker URLs for a topic. The work is done when users have a quick way to obtain a mapping from broker URL to the partitioned topic names it serves, with the expected behavior covered by appropriate tests.

Written by the indexing model from the issue text.