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Add diagnostics-related methods to cros_healthd::ServiceConnection.
These methods will allow Chrome to initiate and control diagnostic
routines on the platform. In the future, remote commands will
consume these diagnostics methods.

Bug: b:128683357
Test: chromeos_unittests --gtest_filter=CrosHealthdServiceConnection.*
Change-Id: I1629a5ae97fb731e49b160edb3d8c2d79f2fc863
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967968Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Paul Moy <pmoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726007}