Introduces Group export feature with ndjson

Merged Kassio Borges requested to merge group-export-with-ndjson into master

#212327 (closed)

What does this MR do?

To improve performance, and the memory footprint of the group export feature, the ability to export a group-tree in the ndjson format is being introduced. This feature is behind a feature flag (:group_export_ndjson) for now.


Originally all the effort to enable ndjson on for Group Import/Export feature was done in one MR, which endup being too big. @ayufan then suggested to split that work on smaller MRs to make the work easier to review.

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Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

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