`hostmetricsreceiver` semantic conventions transition

[braydonk]

This issue will be used to track the work for making hostmetricsreceiver capable of transitioning to Semantic Conventions compliance.

Task list:

• [x] Add feature to mdatagen to allow it to generate packages with names other than metadata (https://github.com/open-telemetry/opentelemetry-collector/issues/11231)
• [ ] Introduce a semantic conventions featuregate in the hostmetrics receiver
• [ ] Add a semconv spec to each receiver and allow it to produce either existing or semconv metrics
  • [ ] processscraper
  • [ ] cpuscraper
  • [ ] diskscraper
  • [ ] filesystemscraper
  • [ ] loadscraper
  • [ ] memoryscraper
  • [ ] networkscraper
  • [ ] pagingscraper
• [ ] Unify the processscraper and processesscraper since the processes.* metrics are being moved to process.* (https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/30894) (Blocked on https://github.com/open-telemetry/opentelemetry-collector/pull/10065)

[github-actions[bot]]

Pinging code owners for receiver/hostmetrics: @dmitryax @braydonk. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[crobert-1]

Removing needs triage as this makes sense to me, and was filed by a code owner.