Add support for GCP PubSub Subscription filter

[brachipa]

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Description

In GCP PubSub there is new feature filters

it will be very helpful if you support it, since it is useful feature in PubSub.
I cab't create the PubSub in TF and then add the filter since the filter can't be set after subscription is created.

New or Affected Resource(s)

• google_PubSub

Potential Terraform Configuration

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

resource "google_pubsub_subscription" "example" {
  name  = "example-subscription"
  topic = google_pubsub_topic.example.name

  labels = {
    foo = "bar"
  }

  # 20 minutes
  message_retention_duration = "1200s"
  retain_acked_messages      = true

  ack_deadline_seconds = 20

  expiration_policy {
    ttl = "300000.5s"
  }

 filter="attributes:domain"
--


"

}

References

[tim-codes]

Looking to contribute to this issue however getting a bit confused by the source code. I can see that the resource is generated by magic modules as it has the "AUTO GENERATED CODE" warning in the source file. However, following the contribution guide and the link to this repository I'm unable to find the corresponding code for the pubsub subscription.

[danawillow]

@tim-codes the third_party folder only has the non-generated resources. Since pubsub is generated, its definition lives at https://github.com/GoogleCloudPlatform/magic-modules/tree/master/products/pubsub (api.yaml and terraform.yaml). I'd also recommend reading through the README/codelab to get a sense of how to do things in MM, but happy to have you help out with this! Thanks!