[Feature/Operator] Multi-k8s support

[juldrixx]

From nifikop created by erdrix: Orange-OpenSource/nifikop#4

Feature Request

Is your feature request related to a problem? Please describe.

Regarding multi cluster k8s situation, it would be great if the operator could support multi-kubernetes deployment. It should allow :

• For stateless dataflows multi-site deployment
• NiFi cluster deployed on multi-site (bench performance to validate it)
• One operator to manage them all !

Describe the solution you'd like to see

We have at least two ways of doing so :

• Use admiralty sdk such as in casskop
• Check istio Operator implementation for remote (seems more flexible).