Allow Setting AutoTopicCreation on Pulsar Namespace Resources

[asher-goldberg]

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Description

It would be nice to be able to set/override/remove auto topic creation through the namespace policies when adding a namespace resource via TF. We set this at the broker level but there are some namespace we don't want it on.

New or Affected Resource(s)

• pulsar_namespace

Potential Terraform Configuration

I think the clearest way to do this is as a separate object within the resource like the retention and persistent policy blocks. The three keys below match what the admin client requires.

resource "pulsar_namespace" "namespace" {
  tenant = "public"
  namespace = "test"

  topic_auto_creation {
    allow = true
    type = "partitioned"
    partitions = 3
  } 
}

resource "pulsar_namespace" "namespace" {
  tenant = "public"
  namespace = "test"

  topic_auto_creation {
    allow = false
  } 
}

If allow is set to false then type and partitions should be optional.

[jiangpengcheng]

The underlying library(pulsar-client-go) doesn't expose the GetTopicAutoCreation yet, so I created a PR here: apache/pulsar-client-go#1151

will add topic auto-creation in this repo after the above PR is merged