zeCommandListAppendWaitOnEvents API issues

The API for zeCommandListAppendWaitOnEvents is analogous to clEnqueuMarkerWithWaitList in OpenCL
There are a couple of issues

1. There is no information on how the Level Zero API behaves when the wait list is empty. According to OpenCL i.e. https://www.khronos.org/registry/OpenCL//sdk/2.2/docs/man/html/clEnqueueMarkerWithWaitList.html
   the behavior is defined as "If event_wait_list is NULL, then this particular command waits until all previous enqueued commands to command_queue have completed."

In addition - the OpenCL API returns an event that can be used. To achieve the same behavior in Level Zero, an additional API call is needed i.e.zeCommandListAppendSignalEvent which returns an event.
It would be useful to have the same API behavior as clEnqueueMarkerWithWaitList

Inizia con zeCommandListAppendWaitOnEvents e zeCommandListAppendSignalEvent, quindi confronta il loro comportamento documentato con il riferimento di OpenCL a clEnqueueMarkerWithWaitList. Esamina i requisiti relativi a una wait-list vuota e all’evento restituito negli header della specifica Level Zero e nel loader; il lavoro è completato quando il comportamento richiesto dell’API è stato risolto esplicitamente.