It would be useful if a Tor controller could detect when a new hidden service descriptor is generated for a local hidden service. Currently a `HS_DESC UPLOADED` event is produced when a descriptor is uploaded to the HSDir system. However if the descriptor is not being distributed via the HSDir system (PublishHidServDescriptors == 0) then this event would not be produced. A new event such as `HS_NEW_DESC` or a new action on the existing `HS_DESC` event such `HS_DESC CREATED` should be added.