Add `skipBacklog` option to pubsublite subscription creation

[rdooley]

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Description

Currently the pubsublite subscription does not offer an option to pass the skipBacklog boolean variable on create to the GCP api, meaning that users are required to either manually initiate a seek operation on the subscription or process a full backlog if creating a subscription on a topic with data.

New or Affected Resource(s)

• google_pubsub_lite_subscription

Potential Terraform Configuration

resource "google_pubsub_lite_subscription" "example" {
  name  = "example-subscription"
  topic = google_pubsub_lite_topic.example.name
  delivery_config {
    delivery_requirement = "DELIVER_AFTER_STORED"
  }
  skip_backlog = true // optional boolean, default to false to match gcp api
}

References

None