AK 2.7.0, Schema Registry, and KSQL

Included in this release:

• Upgrade to Apache Kafka 2.7.0 and Confluent 6.1.0.
• SchemaRegistry API to manage schemas in Confluent Schema Registry.
• KSQL API to integrate with ksqlDB.
• Schema Registry and KSQL APIs available from the REPL.
• Improvements in the KAdmin API.

First release

Initial release including the following:

• Kukulcan API for Scala and Java
  • KAdmin: grouped utils for administrative operations for topics, configs, ACLs and metrics.
  • KConnect: methods to execute request agains Kafka Connect.
  • KConsumer and KProducer: Kafka consumer/producer with some extra features.
  • KStreams: extends Kafka Streams to see how your topology is (printing it in a graph).
• Kukulcan REPL
  • Ammonite: an Ammonite REPL for the Scala API.
  • Scala: a REPL for the Scala API.
  • JShell: a REPL based on JShell for the Java API.
  • PyKukulcan: a Python REPL with bindings for the Java API.
• Binaries to run each the REPLs in POSIX and Windows OS.
• Default config files for the REPLs.
• Scala & Java docs.