Support Azure Volume based snapshot for backups

[viniciusvarzea]

Feature Request

Is your feature request related to a problem? Please describe:

Describe the feature you'd like:
Tidb running on Aws Kubernetes are able to backup using EBS volume snapshots. May you guys please make this feature available on azure aks ?

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-incremental-snapshots?tabs=azure-cli

[csuzhangxc]

sorry, we have no plan to support snapshot backup on azure AKS currently.