List policies

curl --request GET \
  --url https://agentgateway-admin.dev.neuraltrust.ai/v1/gateways/{gateway_id}/policies \
  --header 'Authorization: <api-key>'

{
  "items": [
    {
      "consumer_ids": [
        "<string>"
      ],
      "created_at": "<string>",
      "description": "<string>",
      "enabled": true,
      "gateway_id": "<string>",
      "global": true,
      "id": "<string>",
      "mode": "<string>",
      "name": "<string>",
      "parallel": true,
      "priority": 123,
      "settings": {},
      "slug": "<string>",
      "stages": [
        "<string>"
      ],
      "updated_at": "<string>"
    }
  ],
  "page": 123,
  "size": 123,
  "total": 123
}