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GpuEventSynchronizer: extract backend-specific functionality

Andrey Alekseenko requested to merge aa-2527-unify-gpu-event-synchronizer into master

No new functionality or added checks.

Preparatory work for adding advanced event accounting logic to GpuEventSynchronizer.

DeviceEvent class contains only backend-specific functions and minimal sanity checks. The more advanced logic (the one we're trying to fix in #3988) is kept in GpuEventSynchronizer, and currently left unchanged (1:1 for OpenCL and SYCL, very relaxed rules for CUDA).

Refs #2527, #3988.

Light-weight version of !1205 (closed) to facilitate !1832 (merged).

Edited by Andrey Alekseenko

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