Consider adding Storage Connectors

I see there are examples for JDBC and Elastic, so perhaps the storage based connectors can be included as well?

HDFS: A Hadoop installation shouldn't be required since HDFS URI can be set to local filesystem. I've tested with `hdfs.url=file:///tmp/kafka-connect`, and it worked as expected.

S3: An AWS account isn't required. See - https://blog.minio.io/journaling-kafka-messages-with-s3-connector-and-minio-83651a51045d

I have some workable code for at least S3 here - https://github.com/cricket007/kafka-connect-sandbox

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Extras: Use something like Apache Drill to connect to the local Zookeeper Server and run Drill SQL queries over data (can query JSON and Avro files)