WIP: Instant kraft demo

[addisonhuddy]

Creating a single node, lightweight KRaft example that is based on the cp-all-in-one-kraft demo. Over time, this demo will evolve as the KRaft tooling improves. The main goal of the example is to show how easy it is to run Kafka in KRaft mode.

Includes

• docker-compose file
• readme with instructions on how to run the example.
• a run script to get around some of the current ZK checks in the Confluent Kafka docker image.

[joel-hamill]

@addisonhuddy fyi moved this back to "draft" mode to avoid the stale PR reminders.

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