[Metricbeat]Kubernetes: add resource quotas via kube-state-metrics

[odacremolbap]

Adding kube-state-metrics' ResourceQuota support

See: #6659

This PR brings resource quota information to the kubernetes module.
Test instructions for setting up the environment are located at https://github.com/elastic/beats/blob/master/metricbeat/module/kubernetes/_meta/test/docs/README.md including a ResourceQuota example at the objects subfolder.

ResourceQuota PR Check:

• ScopeSelector: do they create prometheus labels when used?
  Answer is no
• Scope: do they create prometheus labels when used?
  Answer is no

Generic PR Check:

• Changelog entry
• Golden Files
• Manual test info
• Config reference

[odacremolbap]

This is reviewable now, although the Changelog entry is still needed, current one is still targeting 7.4.0

[jsoriano]

It looks good, only a couple of comments and a proposal that may be not so good depending on what we can do with our current helpers.

[jsoriano]

This is reviewable now, although the Changelog entry is still needed, current one is still targeting 7.4.0

@odacremolbap do you mean 7.5.0?

[odacremolbap]

This is reviewable now, although the Changelog entry is still needed, current one is still targeting 7.4.0

@odacremolbap do you mean 7.5.0?

Is it targeting 7.5.0 now?
I can see this issue #13698 open. I don't know the process, but I guess I need to wait for it to roll over to add this change.

[jsoriano]

This is reviewable now, although the Changelog entry is still needed, current one is still targeting 7.4.0

@odacremolbap do you mean 7.5.0?

Is it targeting 7.5.0 now?
I can see this issue #13698 open. I don't know the process, but I guess I need to wait for it to roll over to add this change.

Oh right, I thought that you meant the version where this change would be released 🙂

[jsoriano]

LGTM, but please remove the commented out fetching code.

[odacremolbap]

jenkins, test this

[odacremolbap]

jenkins, test this