0.2.0 Add `disk_size` to the example. Add tags for autoscaler

what

• Add disk_size to the example
• Add tags for autoscaler

why

• disk_size was defined in tfvars but not provided to the example module
• Even if you install cluster-autoscaler, without the tags autoscaling does not work

references

• https://docs.aws.amazon.com/eks/latest/userguide/cluster-autoscaler.html