feat(vm): add support for watchdog

[bpg]

Contributor's Note

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have added / updated acceptance tests in /fwprovider/tests for any new or updated resources / data sources.
• I have ran make example to verify that the change works as expected.

Proof of Work

Example of a VM config with default watchdog type:

resource "proxmox_virtual_environment_vm" "test_vm" {
  node_name = "pve"
  name      = "watchdog-test"
  started   = false

  watchdog {
    enabled = true
    action  = "reset"
  }
}

❯ tofu apply -auto-approve

OpenTofu used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

OpenTofu will perform the following actions:

  # proxmox_virtual_environment_vm.test_vm will be created
  + resource "proxmox_virtual_environment_vm" "test_vm" {
      + acpi                    = true
      + bios                    = "seabios"
      + id                      = (known after apply)
      + ipv4_addresses          = (known after apply)
      + ipv6_addresses          = (known after apply)
      + keyboard_layout         = "en-us"
      + mac_addresses           = (known after apply)
      + migrate                 = false
      + name                    = "watchdog-test"
      + network_interface_names = (known after apply)
      + node_name               = "pve"
      + on_boot                 = true
      + protection              = false
      + reboot                  = false
      + scsi_hardware           = "virtio-scsi-pci"
      + started                 = false
      + stop_on_destroy         = false
      + tablet_device           = true
      + template                = false
      + timeout_clone           = 1800
      + timeout_create          = 1800
      + timeout_migrate         = 1800
      + timeout_move_disk       = 1800
      + timeout_reboot          = 1800
      + timeout_shutdown_vm     = 1800
      + timeout_start_vm        = 1800
      + timeout_stop_vm         = 300
      + vm_id                   = (known after apply)

      + watchdog {
          + action  = "reset"
          + enabled = true
          + model   = "i6300esb"
        }
    }

Plan: 1 to add, 0 to change, 0 to destroy.
proxmox_virtual_environment_vm.test_vm: Creating...
proxmox_virtual_environment_vm.test_vm: Creation complete after 0s [id=100]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

root@pve:~# qm config 100
acpi: 1
agent: enabled=0,fstrim_cloned_disks=0,type=virtio
balloon: 0
bios: seabios
boot: order=net0
cores: 1
cpu: cputype=qemu64
cpuunits: 1024
keyboard: en-us
memory: 512
meta: creation-qemu=9.0.2,ctime=1727706507
name: watchdog-test
numa: 0
onboot: 1
ostype: other
protection: 0
scsihw: virtio-scsi-pci
smbios1: uuid=080f7493-0a5e-4ea1-a188-c69db49a6ab3
sockets: 1
tablet: 1
template: 0
vga: memory=16,type=std
vmgenid: 41838675-f047-462e-b8c0-1825d1f81dbb
watchdog: model=i6300esb,action=reset

Community Note

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Closes #1508

[mergify]

🤖 LGTM! beep boop