[Pytorch Edge] Support profiling kineto events from external source (#64397)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64397
This diff exposes a way to add events to kineto profiler from external
source.
This can be a backend that executes a subgraph and wants to record this
execution in kineto profiler.
This diff also adds "backend" metadata to identify the backend an event
would have executed on.
Test Plan:
test_lite_interpreter
Imported from OSS
Reviewed By: raziel
Differential Revision: D30710710
fbshipit-source-id: 51399f9b0b647bc2d0076074ad4ea9286d0ef3e2
