Changes to List of reports

the data/items/include_account_natures response's property type changed from array of strings to array for status 200

removed the required property data/items/created_at from the response with the 200 status

added the non-success response with the status 404

added the non-success response with the status 406

added the optional property data/items/include_account_natures to the response with the 200 status