Add "freeTimeSource" field to REST API

General Description: Our REST API should have the information available in the response that a user can see in the UI. As we continue to iterate on the RMS UI, we need to update the REST API. The recent enhancement to show the source of free time information needs to be updated in our API.

Current Functionality: There is no source information available.

Future Proposal: Add a "freeTimeSource" field in our API Response. Ensure the field is included in the Free Time object.