What is the method for configuring the stateful property of an Openstack security group in Terraform?

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The stateful property of an Openstack security group can be configured in Terraform by setting the egress.#.stateful argument to true. This sets the rule to be stateful, meaning that responses to allowed outbound traffic are automatically allowed to return to the originating instance. For example:

resource "openstack_networking_secgroup_v2" "example" {
  name = "example-security-group"

  rule {
    remote_ip_prefix = "0.0.0.0/0"
    direction        = "egress"
    protocol         = "tcp"
    port_range_min   = 1
    port_range_max   = 65535
    stateful         = true
  }
}