Enable IPC events and update tests to test stream-ordered IPC

[leofang]

We probably don't have time to cover it in cuda.core 0.4.0, but we need to at least confirm that a future inclusion does not break the new IPC APIs. If so, this is a blocking issue that must be resolved before code freeze.

[leofang]

@Andy-Jost should prove me wrong, but I believe we already kept a door for this.

• In the exporting process:
  • create an Event with the support_ipc flag set
  • call Event.to_ipc_descriptor() to have something that can be serialized and sent over to child
• In the importing process:
  • call a new Event.from_ipc_descriptor() constructor to reconstruct an Event object

The to/from methods are named in line with what we have for Buffer that's being modified in #1020.

Andy, please confirm if my understanding is correct, and then I'll move this task to the next milestone/release.

[leofang]

Discussed with Andy offline:

• we agreed the above understanding is correct and there is no breaking change needed
• we will change the event option from support_ipc to ipc_enabled to ensure consistent UX when we work on this task, while it might seem like a breaking change, it is not because it has never worked so far:
  

  cuda-python/cuda_core/cuda/core/experimental/_event.pyx

  Lines 110 to 111 in b09d7ed

  	if opts.support_ipc:
  	raise NotImplementedError("WIP: https://github.com/NVIDIA/cuda-python/issues/103")

Pushing this to the next cycle.