feat: add --pprof-bind-address flag for runtime profiling

[mikenairn]

Summary

Adds runtime profiling support via Go's built-in pprof using controller-runtime's PprofBindAddress option. Enabled by default on :8082.

Motivation

pprof is the standard mechanism for diagnosing performance issues in Go applications. The Kubernetes kube-apiserver enables profiling via --profiling (default: true), exposing the same /debug/pprof/ endpoints. OpenShift provides built-in tooling for collecting pprof data from cluster components.

The dns-operator already has this flag enabled by default on :8082. This PR brings Authorino in line.

Changes

• Added pprofAddr field to commonServerOptions struct
• Added --pprof-bind-address flag (default :8082) via cobra PersistentFlags
• Added PprofBindAddress to both the auth server and webhook server ctrl.Options
• Added ## Profiling section to README.md

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