Bring common controller config items out into interface

[shreyas-s-rao]

How to categorize this issue?

/area quality
/kind enhancement

What would you like to be added:

Create interface for controller Config, which includes Workers and FeatureGates, and collect all CaptureFeatureActivations methods into a single method on the interface, which is called for all controllers by default.

Why is this needed:
Harmonize configurations for all the controllers, and the webhooks as well to some extent. For instance, since all controllers specify Workers in their configs, this can be brought out as a common configuration item. Similarly, FeatureGates is used by all controllers and webhooks, so that can be brought out as a common config item as well.