Azure environment printer

[rmvangun]

Adds support for configuring context specific data for an Azure profile / context, such that you can configure a section in windsor.yaml as follows:

contexts:
  production:
    azure:
      enabled: true
      subscription_id: your-subscription-id
      tenant_id: your-tenant-id

This results in the followig env vars on the context:

export ARM_SUBSCRIPTION_ID="your-subscription-id"
export ARM_TENANT_ID="your-tenant-id"
export AZURE_CONFIG_DIR="/path/to/contexts/local/.azure"
export AZURE_CORE_LOGIN_EXPERIENCE_V2="false"

To log in to Azure, if you are on a context, all that is required is az login. You will be prompted to log in via the SSO flow locally. In automated contexts, it's expected to use more automated methods including OIDC, etc.

[hernan82arg]

LGTM, although, I think there is no need for tenant_id.
I've no much experience with Azure, but I've been only setting ARM_SUBSCRIPTION_ID when working on Azure in core repo. Everything else seems to be handled by az login.