Add thread count to metrics reported by hostmetricsreceiver

[davidmirza408]

Is your feature request related to a problem? Please describe.
It would be useful to know the thread count of processes reported on by hostmetricsreceiver

Describe the solution you'd like
Add thread count to metrics reported by hostmetricsreceiver

cc @dmitryax

[github-actions]

Pinging code owners: @dmitryax

[andrzej-stencel]

Fixed by #12802.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• receiver/hostmetrics: @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[atoulme]

This is now complete. Please close the issue if you agree.