[receiver/k8scluster] Add phase datapoint attribute for k8s.pod.phase metric

[yuri-rs]

Component(s)

receiver/k8scluster

Is your feature request related to a problem? Please describe.

I'd like to use phase label selector for k8s.pod.phase metric. It is much more convinient and natural to use label filters.

Describe the solution you'd like

I would like to have phase=<Pending|Running|Succeeded|Failed|Unknown> label for k8s.pod.phase metric to be able to use it in queries, like:
k8s.pod.phase{phase="Failed"}

Describe alternatives you've considered

No response

Additional context

Please note that phase is emited as label in https://github.com/kubernetes/kube-state-metrics/blob/main/docs/metrics/workload/pod-metrics.md
See:

[github-actions]

Pinging code owners:

• receiver/k8scluster: @dmitryax @TylerHelmuth @povilasv @ChrsMark

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

[ChrsMark]

That's the plan for modeling states, phases etc as part of open-telemetry/semantic-conventions#1032.

See the related open-telemetry/semantic-conventions#1668 and open-telemetry/semantic-conventions#1554.