Refactor `CatalogSource` controller

[everettraven]

Currently the CatalogSource controller has it's own implementation structure that doesn't match that of existing OLMv1 controllers. In the interest of consistency between the OLMv1 controller implementations, we should update the CatalogSource controller's implementation to be more like:

• operator-controller: https://github.com/operator-framework/operator-controller/blob/main/controllers/operator_controller.go
• rukpak (bundle provisioner): https://github.com/operator-framework/rukpak/blob/218217cdcfb190acafa8e0f4fb8ccec56b22faaf/internal/provisioner/bundle/bundle.go#L139-L232