kubevirt / containerized-data-importer / #5930

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feat: Add checksum validation for HTTP/HTTPS DataVolume sources (#4010)

Introduces cryptographic hash validation for HTTP/HTTPS
import sources to prevent data tampering during download.

**Usage Example:**

```yaml
apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: fedora-dv
spec:
  source:
    http:
      url: "https://download.fedoraproject.org/pub/fedora/linux/releases/39/Cloud/x86_64/images/Fedora-Cloud-Base-39-1.5.x86_64.qcow2"
      checksum: "sha256:c5b50f903e39b3c5d3b7c7bb9a4c5e4f3"
  pvc:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 10Gi
```

Signed-off-by: Yan Zhu <hackzhuyan@gmail.com>

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