🚀 Add a new manager option -- list-metrics

[arybolovlev]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Add a new manager option, -list-metrics, to list all operator-related metrics without needing a connection to the /metrics endpoint or setting up a Prometheus scraper.

Usage Example

$ kubectl exec -it <POD_NAME> -c manager -- ./manager -list-metrics
# HELP hcp_tf_runs HCP Terraform - Pending runs by statuses
# TYPE hcp_tf_runs GAUGE
# HELP hcp_tf_runs_total HCP Terraform - Total number of pending Runs by statuses
# TYPE hcp_tf_runs_total GAUGE

References

N/A.

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