Include Kubernetes Autoscaler as an optional workload

[displague]

The Kubernetes Autoscaler project at version 1.22.1 includes support for the equinixmetal provider.

As a project that bundles many relevant EquinixMetal Kubernetes addons, what would it look like to include the autoscaler as a workload?

• Users could easily modify the autoscaler which would be preconfigured with settings matching the Terraform deployment (location, plan sizes). (This may depend on Add support for metros in cluster-autoscaler for Packet/Equinix Metal kubernetes/autoscaler#4287 since Metro provisioning is a feature of this terraform module)
• Users would need to clean up autoscaler resources before running terraform destroy (unless destroy could do so)
• This terraform module could adopt autoscaler as the way to provision nodes (Are autoscaler node provisioning steps as flexible as they are with Terraform? Is this a desirable feature? Could this be optional (terraform-worker-nodes vs autoscaler-worker-nodes?)?