Prepare Clients and Tools for Apache Kafka's Zookeeper Removal (KIP-500)

What this post added

This post details how to prepare Kafka clients, administrative tools, and the REST Proxy API for the removal of ZooKeeper dependency (KIP-500). It provides specific configuration changes (e.g., `bootstrap.servers` instead of `zookeeper.connect`), command examples for administrative tools (e.g., `kafka-topics --bootstrap-server`), and API version updates for the REST Proxy. It also covers methods for retrieving the Kafka cluster ID without relying on ZooKeeper.