Azure provisioner add optional property for Unified (Office 365) group type

The Azure provisioner currently defaults to security groups. There have been requests to allow Unified (Office 365) groups, and mail enabled groups.

Ref: https://docs.microsoft.com/en-us/graph/api/resources/group?view=graph-rest-1.0

Unifed: groupTypes = ['Unified']

mailEnabled: mailEnabled = true

Security: if not a Unified group. In theory a mail enabled security group can be made, but this has been reported to fail