Enable support for autopilot

[sumerion]

Hi,

Do you plan for support of the autopilot feature?

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/container_cluster#enable_autopilot

I don't know if it's just a matter of adding the property enable_autopilot with the corresponding variable in https://github.com/jenkins-x/terraform-google-jx/blob/master/modules/cluster/main.tf or if that could lead to conflicts with other properties.

Thanks for all the wonderful work you are doing.

Kind regards,
Kris.