[cloud-provider-vsphere][discovery] Add data discoverer for vSphere

[asviel]

Description

Added a feature to discover orphaned disks for vSphere.

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

Partially closes https://github.com/deckhouse/deckhouse/issues/4708.

Why do we need it in the patch release (if we do)?

We don't.

Checklist

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

Changelog entries

section: cloud-provider-vsphere
type: feature
summary: Add a feature to discover orphaned disks for vSphere.
impact_level: default