feat: Port mce-cli to Java.

[jplaisted]

Also moved off the avro format event file to json instead. Much nicer to use :)

#1743

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable)

[mars-lan]

Also need to update the ingestion docker image using this?

[jplaisted]

@keremsahin1 what is that docker image meant to do? It isn't clear to me nor really documented. Just run the ingestion script from docker rather than your machine?

[mars-lan]

@keremsahin1 what is that docker image meant to do? It isn't clear to me nor really documented. Just run the ingestion script from docker rather than your machine?

It's for populating mock data in quickstart: https://github.com/linkedin/datahub/blob/master/docs/quickstart.md. Removing the need to setting up the correct runtime environment (Python before, Java now).

[jplaisted]

Done

[jplaisted]

Also need to update the ingestion docker image using this?

Done, need approval? Seems like I can't mark single comments as resolved. May always be better to "start a review", even with single comments.

[mars-lan]

Great work!