Added Subscription Status to List Providers Endpoint Response

In order to keep you informed what a clinician's billing status is, we added a new object in the response body to show you the subscription status of the clinician in the Axuall system. See below for definitions of the different statuses.

Response Object	Definition
`pending`	The clinician has received an invite (for the very first time).
`activated`	The clinician has logged in and is now a billable clinician.
`deactivating`	The clinician has been set to be deactivated in the Axuall system
`deactivated`	The clinician has been deactivated in the Axuall system and is being deactivated.
`deactivation_failed`	The deactivation process went awry and needs to be remediated before the clinician is completely deactivated in the Axuall system.
`cancelling`	The clinician's invite is being cancelled.
`cancelled`	The clinician's invite is cancelled.
`cancellation_failed`	The invite cancellation process went awry and needs to be remediated before the clinician's invite is completely cancelled.