feat: node metrics analyser

[banjoh]

Description, Motivation and Context

Node metrics analyser which can be used to analyse PVC usage stats like below. Analysis of other stats in the collected can be added on a need to have basis.

apiVersion: troubleshoot.sh/v1beta2
kind: Analyzer
spec:
  analyzers:
    - nodeMetrics:
        checkName: Check minio pvc space usage is less than 80%
        filters:
          pvc:
            nameRegex: "minio-data-ha-minio.*"
            namespace: "minio"
        outcomes:
          - fail:
              when: "pvcUsedPercentage >= 80"
              message: "There are PVCs using more than 80% of storage: {{ .ConcatenatedPVCNames}}"
          - pass:
              message: "No PVCs are using more than 80% of storage"

Running example

$ analyze support-bundle-2024-04-01T11_02_48.tar.gz --analyzers spec.yaml -v=1
Fail: Check minio pvc space usage is less than 80%
 There are PVCs using more than 80% of storage: minio/minio-data-ha-minio-5, minio/minio-data-ha-minio-1

Fixes: https://github.com/replicatedhq/troubleshoot/issues/1496

Checklist

• [x] New and existing tests pass locally with introduced changes.
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] The commit message(s) are informative and highlight any breaking changes
• [ ] Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No