Apache Pinot

<https://docs.pinot.apache.org/operators/operating-pinot/access-control> does mention the feature, javadoc has an example payload

I created an issue for improving the access control documentation. <https://github.com/apache/pinot/issues/9841>

Meanwhile, we look to have

1. <https://github.com/apache/pinot/blob/328c0c23ec2b0a10302a476dfeba2fd5f7a69ac6/pinot-broker/src/main/java/org/apache/pinot/broker/broker/BasicAuthAccessControlFactory.java|BasicAuthAccess>
2. <https://github.com/apache/pinot/blob/989df641b7d29e18773a668663b0be894835d24f/pinot-broker/src/main/java/org/apache/pinot/broker/broker/ZkBasicAuthAccessControlFactory.java|ZkBasicAuthAccess>