Proposal: Container and Engine telemetry

This is proposing to add per container metrics, based on cgroups, as well as
docker engine metrics about Docker's internal health and job management.

This will either solve or at least provide a basis to address #8875, #1091, #4530, #5473, #8842

Signed-off-by: Johannes 'fish' Ziemke <github@freigeist.org>