Add support for enforceInTransit field in `google_pubsub_topic`

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Description

This resource (pubsub topic) is missing an important parameter i.e. enableInTransit that restricts the messages to flow via non-allowed regions

Ref: https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.topics#messagestoragepolicy

It's set to false by default but since there is not option to set it via tf resources which is very unhelpful for automation task.

https://github.com/hashicorp/terraform-provider-google/blob/0e2f5eade7138de880b0814b54f20be00ba99049/google/services/pubsub/resource_pubsub_topic.go#L144

New or Affected Resource(s)

google_pubsub_topic

Potential Terraform Configuration

resource "google_pubsub_topic" "example" {
  name = "example-topic"

  message_storage_policy {
    allowed_persistence_regions = [
      "europe-west3",
    ]
    enforce_in_transit = true
  }
}

References

b/372207550

hashicorp / terraform-provider-google