Add Tracer to the telemetry lib
This wraps the tracer and allows us to capture keyboard interrupts.
This is based on cros builds chromite_tracer:
https://crrev.com/ff59bf4edd7614a50f27e1cc067e0b6f0af62f1e/lib/telemetry/trace/chromite_tracer.py
except the failed_packages removed (and a custom span is subsequently
not needed)
Bug: 326277821
Change-Id: I0ac60797563c777ee00abac1e5924c45fb59df29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5896032
Commit-Queue: Struan Shrimpton <sshrimp@google.com>
Reviewed-by: Terrence Reilly <treilly@google.com>
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Struan Shrimpton