Support new beta features for PubSub subscriptions

[rolandkool]

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Description

Subscriptions are expired by GCP automatically after 31 days of inactivity. The lifecycle can be configured using a beta feature. It would be nice and useful if terraform would support this. Additional new options for retaining ack'd messages and message retention duration could be supported as well.

Also, if a subscription gets removed by GCP due to inactivity and terraform runs, it needs to be able to recreate it without error.

New or Affected Resource(s)

• google_pubsub_subscription

Potential Terraform Configuration

resource "google_pubsub_subscription" "default" {
  name  = "default-subscription"
  topic = "${google_pubsub_topic.default-topic.name}"

  retain_acked_messages = false
  message_retention_duration = "15m"
  expiration_policy {
    ttl: "15d"
  }
}

References

https://cloud.google.com/pubsub/docs/subscriber#lifecycle
https://cloud.google.com/pubsub/docs/subscriber#expiration
https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions/create

[rileykarson]

Partially completed by GoogleCloudPlatform/magic-modules#1481, https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions#ExpirationPolicy is left I think.

[rolandkool]

@rileykarson Indeed, it would be nice if that got supported as well. If you are working on this, would it be possible to also check out #3210?
Thanks

[tysen]

Referenced PR fixes this.

[ghost]

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