[FEATURE REQ] Publish quick-start doc of Java Kafka to include credential-free connection

[saragluna]

Context

With the Azure Identities feature enabled in #28685, quickstart introducing how to use Java with Kafka should be created.

There's a template worked out by Alex can be found here:

• https://github.com/MicrosoftDocs/azure-docs-pr/pull/203348#issuecomment-1205727432
• https://github.com/MicrosoftDocs/azure-docs-pr/pull/203348#issuecomment-1203381358

The doc should focus on how to use credential-free connections with Kafka and username/password.

Goal

Publish migration documentation after the feature is enabled.