3scale operator cluster scoping

What

RHOAM team would like to extend 3scale operator functionalities to make it cluster scoped as well as namespace scoped. There is an epic in Managed API board that has a few tasks that were highlighted and will help the RHOAM team to move this feature forward.
Epic Link: https://issues.redhat.com/browse/MGDAPI-1595

Some of the areas that are going to have to be taken into consideration:
1. We also need the 3scale operator to be namespace scoped for backward compatibility, we need to ensure that customers that want to stay on namespace scoped 3scale operator can do so
2. We need to check how will the upgrade path look like ie from namespace scoped to cluster scoped

3. A testing plan must be agreed on between RHOAM and 3scale QE team