Add in support for Azure Keyvault

[akata72]

Secrets should be retrieved and stored in Azure Keyvault

For this deployment it would be helpful if an Azure Keyvault was either deployed as an optional resource to handle secrets (or reference to existing vault could be given). ( this could potentially be used for storing Sasviya secrets in workload deployments as well).

Thanks!

[thpang]

Added the note here that a solution like this would have to be investigated across all of the current cloud providers supported by SAS Viya 4.

[riragh]

At this time adding support for Azure keyvault is not priority but will be investigated in future.