Migrate existing Structured Logging topic to https://k8s.dev/

**What would you like to be migrated**
- Add a page inside https://k8s.dev/ to contain the current content of https://kubernetes.io/docs/concepts/cluster-administration/system-logs/#structured-logging
- Replace the existing https://kubernetes.io/docs/concepts/cluster-administration/system-logs/#structured-logging content with new documentation aimed at system administrators. For example, explain how to benefit the log structure to make querying more effective

**Why is this needed**
https://kubernetes.io/docs/concepts/cluster-administration/system-logs/#structured-logging is mostly aimed at Kubernetes contributors, not cluster operators. Documentation for contributors should live within https://k8s.dev/

**Comments**
/sig instrumentation
/sig contributor-experience