Support toset

[t0yv0]

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Issue details

Lack of toset function support blocks a handful (4) AWS examples. The most prominent one is:

    resource "aws_eks_node_group" "example" {
      cluster_name    = "example"
      node_group_name = "example"

      # ... other configuration ...
    }

    resource "aws_autoscaling_group_tag" "example" {
      for_each = toset(
        [for asg in flatten(
          [for resources in aws_eks_node_group.example.resources : resources.autoscaling_groups]
        ) : asg.name]
      )

      autoscaling_group_name = each.value

      tag {
        key   = "k8s.io/cluster-autoscaler/node-template/label/eks.amazonaws.com/capacityType"
        value = "SPOT"

        propagate_at_launch = false
      }
    }

Sets are represented as lists in Pulumi but this function deduplicates at runtime. Perhaps we can get by with a non-deduplicating implementation for starters, since the provider will deduplicate anyway.

Affected area/feature