[AspNetCore] Adding support for Azure Blob Storage to store Data Protection

[kdcllc]

In Kubernetes we have pods coming being brought up and destroyed, thus if the web app is using the cookies that rely on DataProtection the support for the keys is critical that can encrypt and decrypt across many instances of the pods.

• Access to Azure Storage has to be provided via MSI
• The key file stored on the Azure storage must be encrypted with Azure Key service.

References:

• Using Azure Key Vault and Azure Storage to store Data Protection keys with ASP.NET Core
• Configure ASP.NET Core Data Protection