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dfa0fe0d - Add ChromiumEventLogger, log FXGraphCache and AOTAutogradCache (#132864)

Add ChromiumEventLogger, log FXGraphCache and AOTAutogradCache (#132864) Summary: This PR implements ChromiumEventLogger in all dynamo_timed events. For each dynamo timed call, we log: - A start event before starting the function execution - An end event after finishing the function execution - An extra pair of start/end events for any phase names included in dynamo. Separately, this also gives us the ability to log instant events. I use them to log cache hits/misses as a first step. The little arrows on the bottom of the UI are cache hits/misses, and you can look at cache details by clicking each triangle. The outputted chromium trace events can be viewed in perfetto for a timeline of an execution. Here's what it looks like for a run of nanogpt:  And another with warm start:  Trace events are based around the JSON Event format: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview We may want to switch to the less deprecated Protobuf format later, but so far I don't see any features we care about supported there. Internal FB employees can see a link to this in the tlparse output: https://interncache-all.fbcdn.net/manifold/tlparse_reports/tree/logs/.tmpVi1FIl/dedicated_log_torch_trace_bb4zl_bc.log/index.html I'll also work on logging these X-link: https://github.com/pytorch/pytorch/pull/132864 Approved by: https://github.com/aorenste Reviewed By: fbgheith Differential Revision: D61069477 Pulled By: jamesjwu fbshipit-source-id: d9249644d755a0aa4c4280ae8bdaf8163486ead8