Add processor to detect shared events + customization to duplicate.

Motivation and Context

When an event shape is shared between multiple eventstreams, it causes SDK generation/compilation failures. The top level shape POJO implements the event stream interface for each stream and the return type of the sdkEventType method conflicts.

Modifications

This PR adds two things:

1. A new customization config (duplicateAndRenameSharedEvents)
2. A new processor (EventStreamSharedEventProcessor) which applies the customization and raises helpful error messages if shared events are detected.

Testing

Added new unit tests to cover processor/config. Manual testing of internal service model that raised this issue.

Screenshots (if appropriate)

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x ] New feature (non-breaking change which adds functionality)

Checklist

• [ x] I have read the CONTRIBUTING document
• [ x] Local run of mvn install succeeds
• [ x] My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• [ x] I have added tests to cover my changes
• [ x] All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• [x ] I confirm that this pull request can be released under the Apache 2 license