Add `az storage blob sync` command for automatic blob synchronization

[EncryptedNomadOmega87]

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[yonzhan]

Please create this feature ask following the template https://github.com/Azure/azure-cli/blob/dev/doc/how_to_request_a_feature_in_cli.md

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @xgithubtriage.

[EncryptedNomadOmega87]