[BUG]: Multiple errors in error_details can't be unmarshalled

[jerbob92]

Describe the bug When calling an endpoint that can return multiple errors (for example the event batch endpoint), RESTY can't parse the error into the error struct.

The error is:

WARN RESTY Cannot unmarshal response body: json: cannot unmarshal object into Go struct field Error.error_details of type []string

The JSON response of the error:

{
  "status": 422,
  "error": "Unprocessable Entity",
  "code": "validation_errors",
  "error_details": {
    "0": {
      "transaction_id": [
        "value_already_exist"
      ]
    },
    "1": {
      "transaction_id": [
        "value_already_exist"
      ]
    },
    "2": {
      "transaction_id": [
        "value_already_exist"
      ]
    }
  }
}

To Reproduce Call the event batch endpoint with multiple events that already exist.

Expected behavior Receiving an error struct that contains all the errors in the response.