add sorting fields

[kvaps]

Link PRO-Robotech/openapi-k8s-toolkit#170

Screenshot:

Example resource:

apiVersion: dashboard.cozystack.io/v1alpha1
kind: CustomFormsOverride
metadata:
  name: apps.cozystack.io.v1alpha1.virtualmachines
spec:
  customizationId: default-/apps.cozystack.io/v1alpha1/virtualmachines
  hidden:
  - - metadata
    - annotations
  - - metadata
    - labels
  - - metadata
    - namespace
  - - metadata
    - creationTimestamp
  - - metadata
    - deletionGracePeriodSeconds
  - - metadata
    - deletionTimestamp
  - - metadata
    - finalizers
  - - metadata
    - generateName
  - - metadata
    - generation
  - - metadata
    - managedFields
  - - metadata
    - ownerReferences
  - - metadata
    - resourceVersion
  - - metadata
    - selfLink
  - - metadata
    - uid
  - - kind
  - - apiVersion
  - - appVersion
  - - status
  sort:
  - - apiVersion
  - - appVersion
  - - kind
  - - metadata
  - - metadata
    - name
  - - spec
  - - spec
    - external
  - - spec
    - externalMethod
  - - spec
    - externalPorts
  - - spec
    - running
  - - spec
    - instanceType
  - - spec
    - instanceProfile
  - - spec
    - systemDisk
  - - spec
    - systemDisk
    - image
  - - spec
    - systemDisk
    - storage
  - - spec
    - systemDisk
    - storageClass
  - - spec
    - gpus
  - - spec
    - resources
  - - spec
    - sshKeys
  - - spec
    - cloudInit
  - - spec
    - cloudInitSeed
  - - spec
    - cloudInitSeed
    - schema
  - - spec
    - cloudInitSeed