feat(datagen): add storage, network, and appliance-OS identities (PIPE-1035)

[Dylan-M]

Proposed Change

Adds appliance-class identities to datagen, so the environment can model storage
arrays and network hardware alongside general-purpose hosts.

• ApplianceOS ({Vendor, Family, Version}) for closed embedded OSes (NimbleOS,
  TMOS, IOS-XE, PAN-OS, and the rest), kept separate from the OSType enum since
  these aren't Linux from a consumer's view.
• StorageSystemIdentity: vendor/model/serial, storage-fabric IDs (WWN, IQN, WWPN,
  NAA in vendor-correct formats), capacity and hardware facets, and a management
  interface. First vendor pools cover HPE (Nimble, 3PAR, the Alletra family,
  StoreOnce).
• NetworkSystemIdentity: base hardware plus composable capability facets (L2
  switching, L3 routing, firewall, load balancing, wireless), so a product composes
  facets like a BIG-IP or Catalyst. First pools cover F5, Cisco, Arista, Juniper,
  Palo Alto, and Fortinet.
• StyleAppliance hostnames ({vendor}-{role}-{site}-{NN}), which don't collide
  with the mythology pools.
• GenerateEnvironment composes storage and network systems alongside general
  systems, sharing the seed config, with StorageSystems / NetworkSystems seed
  overrides and management interfaces bound to subnets.

Validate() rejects malformed WWN/IQN/NAA and incoherent vendor/model combinations.
Nothing outside datagen consumes these yet.

Validation: from a scratch harness, call GenerateEnvironment with a populated
counts config and inspect AllStorageSystems() / AllNetworkSystems() for coherent
vendor/model/OS triples and non-colliding hostnames. Tests cover determinism from a
shared seed, environment composition, vendor/model coherence (a Nimble identity
can't carry tmos), and the Validate() rejections.

Checklist

• Changes are tested
• CI has passed

[Dylan-M]

• feat(config): reject invalid network CIDRs at environment load (PIPE-1002) #281
• feat(generators): emit simulated host identity on every record (PIPE-1036) #280
• feat(resource): support list-valued resource attributes (PIPE-1253) #279
• feat(datagen): environment foundations for simulated host identity (PIPE-1036) #278
• refactor(datagen): thread an injected logger, drop global-logger use (PIPE-1067) #277
• fix(datagen): return errors instead of panicking on developer-error input (PIPE-1003) #276
• feat(datagen): add IPv6 to NetworkIdentity and public emission (PIPE-1001) #275
• feat(datagen): add storage, network, and appliance-OS identities (PIPE-1035) #274 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.