[controller] Add controllers for CephClusterConnection and CephStorageClass resources

[AleksZimin]

Description

This PR introduces new controllers to handle the resources CephClusterConnection and CephStorageClass. These controllers simplify the setup process for the CSI driver for Ceph by consolidating configuration into two resources, reducing the need to manage settings across configmaps, secrets, and StorageClass objects.

Why do we need it, and what problem does it solve?

Previously, setting up the CSI driver for Ceph required managing configurations in configmaps, secrets, and creating StorageClass objects separately. This process was complex and prone to errors. By introducing CephClusterConnection and CephStorageClass resources, we streamline and simplify the setup process, reducing the potential for misconfiguration and making it easier for users to manage their Ceph storage settings.

What is the expected result?

• Simplified setup process for the CSI driver for Ceph.
• Reduced complexity by consolidating configuration into two resources.
• Minimized risk of misconfiguration and improved user experience.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.