Add Azure CLI (az) completion spec

Adds a comprehensive completion spec for the Azure CLI covering:
- Global options: --output, --query, --subscription, --verbose, --debug, --help, --only-show-errors
- Top-level commands: login, logout, configure, feedback, find, interactive, rest, upgrade, version
- Major command groups with full subcommands and options:
  - account (set, show, list, clear, get-access-token, lock, management-group)
  - acr (build, create, delete, list, login, show, repository)
  - ad (app, group, sp, user)
  - aks (create, delete, get-credentials, list, show, scale, upgrade, nodepool)
  - appservice plan (create, delete, list, show, update)
  - container (create, delete, list, logs, show, exec)
  - deployment (group, sub)
  - extension (add, list, list-available, remove, show, update)
  - functionapp (create, delete, list, show, restart, start, stop)
  - group (create, delete, exists, export, list, show, update, lock)
  - keyvault (create, delete, list, show, secret, key)
  - monitor (metrics, activity-log, log-analytics workspace)
  - network (vnet, nsg, public-ip with subnets and rules)
  - resource (list, show, delete, tag)
  - role (assignment, definition)
  - storage (account, blob, container with keys)
  - vm (create, delete, list, show, start, stop, restart, deallocate, resize, open-port, run-command, image)
  - webapp (create, delete, list, show, browse, restart, start, stop, up, log, deployment)

Resolves APP-3512

Co-Authored-By: Oz <oz-agent@warp.dev>

Author: oz-agent