Add a new DPCTLEvent_WaitAndThrow function

[vlad-perevezentsev]

This PR adds a function DPCTLEvent_GetWaitList which waits for the event to complete and calls the asynchronous error handler

[coveralls]

Coverage increased (+0.08%) to 64.911% when pulling f2f701f on vlad-perevezentsev:event_waitandthrow into b283185 on IntelPython:master.

[vlad-perevezentsev]

@diptorupd I added a sycl test that checks the call of the asynchronous error handler in the last commit.
Is it correct for this function?
Do I need to rewrite it via dpctl interface?
Can you tell me how better to write a test for this function?

[oleksandr-pavlyk]

@vlad-perevezentsev please use backquotes rather than plain single quotes to delineate sycl object names.

[oleksandr-pavlyk]

I suppose these tests will do for now, but I thought of using SYC C++ to create an event from submitting a kernel which causes a raise of an asynchronous exception to a queue with a custom handler that a side effect that a test checks for.