add macOS smartmontools support

[gtalusan]

smartmontools is available on macOS. In this PR, I just copy and paste the smart code verbatim from Linux to the Darwin conditional branch.

Below is the output of npm run test showing the smartData field for my 2019-ish iMac's NVMe.

SYSTEMINFORMATION - Test Scripts - Version: 5.23.5
═══════════════════════════════════════════════════════════

┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│  a ... Audio              i ... INET Latency       t ... time               1 ... NET Iface Default     ? ... Get Object    │
│  b ... BIOS               I ... INET Check Site    T ... CPU Temperature    2 ... NET Gateway Default   , ... All Static    │
│  B ... Baseboard          j ... CPU Current Speed  u ... USB                3 ... NET Interfaces        . ... All Dynamic   │
│  C ... Chassis            l ... CPU Current Load   U ... UUID               4 ... NET Stats             / ... All           │
│  c ... CPU                L ... Full Load          v ... Versions           5 ... NET Connections                           │
│  d ... DiskLayout         m ... Memory             V ... Virtual Box                                                        │
│  D ... DiskIO             M ... MEM Layout         w ... WIFI networks                                                      │
│  e ... Block Devices      o ... OS Info            W ... WIFI interfaces    6 ... Docker Info                               │
│  E ... Open Files         p ... Processes          x ... WIFI connections   7 ... Docker Images                             │
│  f ... FS Size            P ... Process Load       y ... System             8 ... Docker Container                          │
│  F ... FS Stats           r ... Printer            Y ... Battery            9 ... Docker Cont Stats                         │
│  g ... Graphics           s ... Services           z ... Users              0 ... Docker Cont Proc                          │
│  h ... Bluetooth          S ... Shell                                       + ... Docker Volumes        q >>> QUIT          │
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
                                                                      
┌────────────────────────────────────────────────┐
│  Disk Layout                         v: 5.23.5 │
└────────────────────────────────────────────────┘
[
  {
    device: 'disk0',
    type: 'NVMe',
    name: 'APPLE SSD SM2048L',
    vendor: 'Apple',
    size: 2001111162880,
    bytesPerSector: null,
    totalCylinders: null,
    totalHeads: null,
    totalSectors: null,
    totalTracks: null,
    tracksPerCylinder: null,
    sectorsPerTrack: null,
    firmwareRevision: 'CXS7LA0Q',
    serialNum: 'XXXXXXXXXXXXXXXXXXXX',
    interfaceType: 'PCIe x4',
    smartStatus: 'Ok',
    temperature: 33,
    smartData: {
      json_format_version: [ 1, 0 ],
      smartctl: {
        version: [ 7, 4 ],
        pre_release: false,
        svn_revision: '5530',
        platform_info: 'Darwin 24.1.0 x86_64',
        build_info: '(local build)',
        argv: [ 'smartctl', '-a', '-j', 'disk0' ],
        exit_status: 0
      },
      local_time: { time_t: 1727721313, asctime: 'Mon Sep 30 14:35:13 2024 EDT' },
      device: {
        name: 'disk0',
        info_name: 'disk0',
        type: 'nvme',
        protocol: 'NVMe'
      },
      model_name: 'APPLE SSD SM2048L',
      serial_number: 'XXXXXXXXXXXXXXXXXXXXXXXX',
      firmware_version: 'CXS7LA0Q',
      nvme_pci_vendor: { id: 5197, subsystem_id: 5197 },
      nvme_ieee_oui_identifier: 9528,
      nvme_controller_id: 2,
      nvme_version: { string: '<1.2', value: 0 },
      nvme_number_of_namespaces: 1,
      smart_support: { available: true, enabled: true },
      smart_status: { passed: true, nvme: { value: 0 } },
      nvme_smart_health_information_log: {
        critical_warning: 0,
        temperature: 33,
        available_spare: 100,
        available_spare_threshold: 10,
        percentage_used: 2,
        data_units_read: 546637491,
        data_units_written: 272903651,
        host_reads: 15888683017,
        host_writes: 6175519199,
        controller_busy_time: 21850,
        power_cycles: 442,
        power_on_hours: 8149,
        unsafe_shutdowns: 127,
        media_errors: 0,
        num_err_log_entries: 0
      },
      temperature: { current: 33 },
      power_cycle_count: 442,
      power_on_time: { hours: 8149 },
      nvme_error_information_log: { size: 64, read: 16, unread: 0 }
    }
  },
  {
    device: 'disk2',
    type: 'USB',
    name: 'Micron_1100_MTFD',
    vendor: '',
    size: 2048408248320,
    bytesPerSector: null,
    totalCylinders: null,
    totalHeads: null,
    totalSectors: null,
    totalTracks: null,
    tracksPerCylinder: null,
    sectorsPerTrack: null,
    firmwareRevision: '',
    serialNum: '0123456789ABCDE',
    interfaceType: 'USB',
    smartStatus: 'not supported',
    temperature: null
  }
]
Time to complete: 1.066s