GCE Plugins : support "disk_encryption_key" in the create_<linux|windows>_instance.yml

[mattBil]

Hello,

I noticed that the parameter "disk_encryption_key" is not supported for GCE instances (here : https://github.com/ansible-community/molecule-plugins/blob/980db38a12043e1685dd0e91e9845f1ae684cab1/src/molecule_plugins/gce/playbooks/tasks/create_linux_instance.yml).
Its existing in the official google module : https://docs.ansible.com/ansible/latest/collections/google/cloud/gcp_compute_instance_module.html#parameter-disks/disk_encryption_key

can I propose an implementation for that in the plugins ?
It would look something like :

    disks:
      - auto_delete: true
        boot: true
        disk_encryption_key:
          raw_key: "{{ item. disk_encryption_key | default(omit) }}"
        initialize_params:
          disk_size_gb: "{{ item.disk_size_gb | default(omit) }}"
          source_image: "{{ item.image | default('projects/debian-cloud/global/images/family/debian-10') }}"
          source_image_encryption_key:
            raw_key: "{{ item.image_encryption_key | default(omit) }}"

[mattBil]

I put a new coin in the machine, if someone can take a look at this request 😃 ?