Azure RBAC based identity support

[laurivosandi]

Is your proposal related to a problem?

Currently only storage account key based authentication is supported which grants the secret owner permissions to all containers (buckets) inside the same storage account.

type: AZURE
config:
  storage_account: "..."
  storage_account_key: "..."
  container: "..."
  endpoint: "blob.core.windows.net"
  max_retries: 3

Describe the solution you'd like

Safer alternative includes identity with specific role based access (preferably upload only)

Describe alternatives you've considered

SAS tokens could also work
#6254