Support Confluent Schema Registry With Authentication

[Ken-LiuL]

Description

Though we could make kafka index work by using avro and kafka extensions, the implementation of the avro part should support Schema Registry with authentications, since normally, if you use Confluent Cloud, the Schema Registry part would have a basic auth mechanism for security reason.

The implementation would be quite straightforward, the current implementation is in the data/input/avro/SchemaRegistryBasedAvroBytesDecoder.java. We could instantiate the CachedSchemaRegistryClient with additional configuration, then authentication and other configs of schema registry could be easily added.

We could add something like this
"avroBytesDecoder": { "type": "schema_registry", "url": "http://schema-registry:8081", "config": { }, }
and replace this line https://github.com/apache/incubator-druid/blob/49bd16766fb347e1aad222b8da7f83bb9e951cde/extensions-core/avro-extensions/src/main/java/org/apache/druid/data/input/avro/SchemaRegistryBasedAvroBytesDecoder.java#L48

Motivation

Support Confluent Schema Registry with authentication

[jadireddi]

I would like to contribute to this PR.

[stale]

This issue has been marked as stale due to 280 days of inactivity. It will be closed in 4 weeks if no further activity occurs. If this issue is still relevant, please simply write any comment. Even if closed, you can still revive the issue at any time or discuss it on the dev@druid.apache.org list. Thank you for your contributions.

[Jimmy-Newtron]

Do you have any target version that will merge this PR ?