Add memory metrics for k8s.pod, k8s.node and container

[ChrsMark]

Fixes #1490.
Part of #1032.

Changes

This PR adds the following metrics that are already in use by the Collector at https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.135.0/receiver/kubeletstatsreceiver/documentation.md.

The metrics are the following:

• k8s.node.memory.available
• k8s.node.memory.rss
• k8s.node.memory.working_set
• k8s.node.memory.page_faults renamed to k8s.node.memory.paging.faults with attribute system.paging.type set to minor
• k8s.node.memory.major_page_faults renamed to k8s.node.memory.paging.faults with attribute system.paging.type set to major
• k8s.pod.memory.available
• k8s.pod.memory.rss
• k8s.pod.memory.working_set
• k8s.pod.memory.page_faults renamed to k8s.pod.memory.paging.faults with attribute system.paging.type set to minor
• k8s.pod.memory.major_page_faults renamed to k8s.pod.memory.paging.faults with attribute system.paging.type set to major
• container.memory.available
• container.memory.rss
• container.memory.working_set
• container.memory.page_faults renamed to container.memory.paging.faults with attribute system.paging.type set to minor
• container.memory.major_page_faults renamed to container.memory.paging.faults with attribute system.paging.type set to major

k8s.node.memory.* and k8s.pod.memory.* metrics are in alignment with what https://pkg.go.dev/k8s.io/[email protected]/pkg/apis/stats/v1alpha1 (this api is used in the Collector implementation).

container.memory.* metrics are in alignment with what cadvisor provides.

refs:

• https://github.com/google/cadvisor/blob/5adb1c3bb38b4c5d50b31f39faf3214a44ae479b/metrics/prometheus.go#L463-L490
• https://github.com/open-telemetry/semantic-conventions/blob/main/model/system/metrics.yaml
• https://github.com/open-telemetry/semantic-conventions/blob/main/model/system/registry.yaml
• https://prometheus.io/docs/guides/cadvisor/

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• Links to the prototypes or existing instrumentations (when adding or changing conventions)

[ChrsMark]

@open-telemetry/specs-semconv-maintainers this one is approved by the K8s SIG, please take a look when you get the chance