Ingest change data from Oracle databases using XStream

Add support for monitoring Oracle databases and writing those changes to Kafka using Kafka Connect.

This involves creating a Kafka Connect source connector for Oracle that creates source tasks as needed. Each source task remotely connects to a Oracle database to read the changes committed into the database, potentially using the XStreams API. When run as part of Kafka Connect, the resulting data change events will be recorded in Kafka logs, and if anything fails Kafka Connect will figure out what was last successfully written and restart a source task to start reading from the next point.

The connector should ideally provide the same behavior, functionality, and options as the MySQL connector. Where possible, this connector should also use the same configuration fields as other connectors.