Changes to List iMessage sandbox contacts

added the new account enum value to the details/budgetScope response property for the response status 401

added the optional property code to the response with the 401 status

added the optional property details to the response with the 401 status

added the optional property docUrl to the response with the 401 status

added the optional property param to the response with the 401 status

added the optional property platform to the response with the 401 status

added the optional property platformError to the response with the 401 status

added the optional property type to the response with the 401 status

endpoint added