[VM] Begin supporting Perfetto file recorder This CL adds the `TimelineEventPerfettoFileRecorder` class, which is a timeline recorder that writes a trace to file in Perfetto's proto format. This CL supports the recording of all types of timeline events except flow events. Support for flow events will be added in a future CL. TEST=Recorded traces with the Perfetto file recorder and explored them in Perfetto's trace viewer, CI Change-Id: Iaa2051e536589a473c5e15f9de9bb9c251f13d38 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/278942 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Derek Xu <derekx@google.com>
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