Support Backup offerings for CKS Cluster deployment

### The required feature described as a wish

As a User/Admin/Operator I would like to ,associated a backup offering to be associated with a cks cluster .

Currently, there is no way to associate a Backup offering during CKS deployment

https://cloudstack.apache.org/api/apidocs-4.22/apis/createKubernetesCluster.html

Associating a backup offering is only possible when virtual machine is deployed from the ui api

https://cloudstack.apache.org/api/apidocs-4.22/apis/assignVirtualMachineToBackupOffering.html
https://cloudstack.apache.org/api/apidocs-4.22/apis/removeVirtualMachineFromBackupOffering.html

Currently user has to manually associate cks-instance (control and worker node ) to a backup offering

Also, we can take a look to support velero as a backup provider for kubernetes cluster

https://velero.io/

Currently hyperscalers support kubernetes backup offering

https://docs.aws.amazon.com/eks/latest/userguide/integration-backup.html
https://learn.microsoft.com/en-us/azure/backup/azure-kubernetes-service-backup-overview
https://docs.cloud.google.com/kubernetes-engine/docs/add-on/backup-for-gke/concepts/backup-for-gke

Comece pela API createKubernetesCluster e pelas APIs assignVirtualMachineToBackupOffering e removeVirtualMachineFromBackupOffering referenciadas na issue. Determine como uma oferta de backup deve ser selecionada durante a implantação do CKS e se o Velero está no escopo; ao final, as instâncias de controle e de worker devem poder receber a oferta de backup solicitada sem associação manual.

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