[profiler] CUDA event fallback (#58133)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58133
Adding CUDA event fallback for cases when CUPTI tracing is not
available, this corresponds to the legacy profiler GPU profiling
Test Plan: python test/test_profiler.py -v
Reviewed By: gdankel
Differential Revision: D28379596
Pulled By: ilia-cher
fbshipit-source-id: 2db3b2cd8c1c3e6e596784ab00a226c69db2ef27
