Extend the kubernetes_all_namespaces data source to utilize labels to filter what is returned

[jbellow]

Description

Currently the kubernetes_all_namespaces data source simply pulls all the namespaces in the cluster and returns that to the caller. I have a use case where I want particular namespaces that have specific labels applied to them. I tried several ways to pull namespaces and associated metadata via terraform, but was never able to the label data that I needed in order to filter.

Potential Terraform Configuration

A potential way this could be achieved is by leveraging the metadata structure and then passing that back to the K8's api call to get the namespaces

data "kubernetes_all_namespaces" "allns" {
  metadata {
    labels = {
      my_awesome_enable_label : true
    }
  }
}

Community Note

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[jbellow]

I have opened #948 to address this issue.

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[simonvanderveldt]

@aareet You commented in the PR that it was in the review queue, but nothing happened with it and now it's closed and not merged. Any chance this can be picked up again? Would be a great feature to have.

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