Add metrics explorer sub-command

[jkremser]

TL;DR

Add the new kedify metrics sub-command for interactively exploring Prometheus metrics and generating autoscaling resources.

Highlights

• Discover Prometheus services from Kubernetes or connect directly using --server.
• Support automated discovery and port-forwarding with --disco.
• Support custom Kubernetes configuration through --context and --kubeconfig.
• Discover Grafana Mimir gateways using their Kubernetes labels.
  • Route Mimir requests through /prometheus.
  • Include X-Scope-OrgID: kedify-agent with every Mimir API request.
• Filter metrics interactively or prefill the filter using --filter.
• Supply PromQL directly through --query.
• Control visualization using --visualize and --horizon.
• Visualize 6-hour, 1-day, 3-day, 1-week, and 1-month ranges with appropriate query resolutions.
• Render cyan ASCII graphs and display memory metrics in MiB.

Resource generation and safety

• Generate ScaledObject, MetricPredictor, or both.
• Print generated YAML by default.
• Allow skipping the YAML editing prompt with --print.
• Before creating resources:
  • Show the complete YAML.
  • Show the active Kubernetes context and target namespace.
  • Require an explicit confirmation that defaults to No.
• Forward the selected context and kubeconfig to discovery, port-forwarding, and resource creation commands.

Automation options

• --disco
• --filter
• --query
• --visualize
• --horizon
• --print
• --context
• --kubeconfig
• --namespace
• --server

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