Add in all_events.json for intracranial processing

[jrudoler]

r1 type events should record an all_events.json file, using EventCombinationTask, like for scalp processing (below)

event_creation/event_creation/submission/pipelines.py

Line 406 in 9aed85f

tasks.append(EventCombinationTask(('task',) + other_events, critical=False,))