When the parent Java process receives a SIGTERM it will now trigger a graceful shutdown of the worker, which dispatches a ShutdownRequestedMessage to all of the record processors. This will allow record processors a final chance to checkpoint before the lease is terminated.
This changes is incompatible with current versions of the MultiLang Clients. A future change will allow older versions MultiLang clients to use newer versions of the Java KCL.
Updated the MultiLangDaemon to use the v2 record processor interfaces, and added features to messages passed to MultiLangDaemon clients.
These changes will require updates to the various MultiLangDaemon clients. The changes for the Python version are complete, and other versions will be updated later.
