Esql dedup keyword

[kfirpeled]

This is just a tech-preview of my ONWEEK. I've hacked my way to showcase a new dedup keyword and how we can leverage in our security solution in kibana.
DO NOT REVIEW

• Have you signed the contributor license agreement?
• Have you followed the contributor guidelines?
• If submitting code, have you built your formula locally prior to submission with gradle check?
• If submitting code, is your pull request against main? Unless there is a good reason otherwise, we prefer pull requests against main and will backport as needed.
• If submitting code, have you checked that your submission is for an OS and architecture that we support?
• If you are submitting this code for a class then read our policy for that.

[elasticsearchmachine]

@kfirpeled please enable the option "Allow edits and access to secrets by maintainers" on your PR. For more information, see the documentation.