List workflow definitions

Example response

{
  "items": [
    {
      "disabled": false,
      "key": "integration.stripe.charge.succeeded",
      "steps": [
        {
          "command": "broadcast",
          "if": "event.amount > 1000",
          "input": {
            "category": "billing",
            "template": "payment_received"
          }
        }
      ]
    }
  ]
}