Backport of hoststats: add package for collecting host statistics including cpu memory and disk usage into release/1.15.x #17532
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Backport
This PR is auto-generated from #17038 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
Description
This PR adds the ability for Consul to report host statistics through go-metrics. These metrics include cpu utilization by core and in aggregate, system memory usage and disk usage for the disk backing the configured data_dir.
Testing & Reproduction steps
Tests were added to assert cpu utilization calculation is performed accurately. Manual testing was performed on linux and darwin to ensure reported host stats values were accurate.
PR Checklist
Overview of commits