The Cloud Controller Manager is a key component of the Kubernetes control plane that integrates a cluster with cloud provider-specific services such as load balancers, storage volumes, and node management. It separates cloud-specific logic from the core Kubernetes components, enabling better modularity and easier maintenance of the control plane. By interacting directly with cloud APIs, it helps manage resources like nodes, routes, and services in a cloud-native environment. In your opinion, why is the Cloud Controller Manager important for Kubernetes running on public clouds, and how does it improve flexibility and portability across different cloud providers?