Document the Switch Lifecycle Workflow #19

Summary

Document how the SONiC Operator and Fabric projects work together while remaining decoupled.

Ref: https://ironcore.dev/network-automation/

Motivation

The SONiC Operator bootstraps the switch and prepares its operating environment. Fabric subsequently manages the switch configuration through its own APIs and components.

A concise overview would clarify these responsibilities and show how the two projects form an end-to-end workflow.