[Telemetry] Log Telemetry's memory usage after collecting all results
[Telemetry] Log Telemetry's memory usage after collecting all results

This will help quantify the efforts in reducing the memory used by the
results object (mostly histograms).

Bug: chromium:780477
Change-Id: I59498c0f7e52d6528e301c19e8f6db2fc5d8fe73
Reviewed-on: https://chromium-review.googlesource.com/759000
Commit-Queue: Ned Nguyen <8e49e083cfcfb68517585b2e78d68c2fd2b70562@google.com>
Reviewed-by: Ned Nguyen <8e49e083cfcfb68517585b2e78d68c2fd2b70562@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult