[WIP] Add partition based even scaling kafka scaler

[patelvp]

Issue: #2581
Enhance the Kafka Scaler or create a new KEDA Scaler to support scaling Kafka by partitions per pod as opposed to simple increase in pod count.

Checklist

• When introducing a new scaler, I agree with the scaling governance policy
• I have verified that my change is according to the deprecations & breaking changes policy
• Tests have been added
• Changelog has been updated and is aligned with our changelog requirements
• A PR is opened to update our Helm chart (repo) (if applicable, ie. when deployment manifests are modified)
• A PR is opened to update the documentation on (repo) (if applicable)
• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #

Relates to #

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[JorTurFer]

Is this still WIP? Can we review it or it's just abandoned?

[stale]

This issue has been automatically closed due to inactivity.

[patelvp]

Is this still WIP? Can we review it or it's just abandoned?

Sorry been on a vacation.

@JorTurFer I am waiting on some discussions here #2581 (comment)