Get the email address of this project's GCS service account.
get(projectId)
Get the email address of this project's GCS service account.
Args:
projectId: string, Project ID (required)
Returns:
An object of the form:
{ # A subscription to receive Google PubSub notifications.
"kind": "storage#serviceAccount", # The kind of item this is. For notifications, this is always storage#notification.
"email_address": "A String", # The ID of the notification.
}