Implement the ability to share Thread catalog between different dataiku instances

[itoledoc]

Is your feature request related to a problem? Please describe.
Our organization has multiple dataiku design nodes or instances. Having a catalog that is consistent and "up-to-date" between the instances is important.

Describe the solution you'd like
We would like to be able to share one catalog between the different instances.

Describe alternatives you've considered
An alternative, discussed with @rymoore99, is to export the catalog as Dataiku Project, and import it in other instances. This is a nice feature I wasn't aware of, but I think it might be useful to migrate instances, but it only partially solves the problem of having a single consistent catalog, or it might require a lot of manual work and discipline to achieve the goal in a daily basis.