Add Yaml support in addition to json

[Mike-c-Jackson]

Could something like the following be added to the OpenApi utils as many swaggers use a yaml versus a json from their backend?
Here is an implementation that uses Jackson:

String convertYamlToJson(String yaml) {
    ObjectMapper yamlReader = new ObjectMapper(new YAMLFactory());
    Object obj = yamlReader.readValue(yaml, Object.class);

    ObjectMapper jsonWriter = new ObjectMapper();
    return jsonWriter.writeValueAsString(obj);
}

[Mike-c-Jackson]

Here are two additions that we have implemented to capture the yaml and to convert the yaml to a json file for use:

  private static void saveYamlFromUrl(URL url, String filePath) throws IOException {
    ReadableByteChannel readableByteChannel = Channels.newChannel(url.openStream());

    File yaml = new File(filePath + ".yaml");
    yaml.getParentFile().mkdirs();
    yaml.createNewFile();
    FileOutputStream fileOutputStream = new FileOutputStream(yaml, false);
    FileChannel fileChannel = fileOutputStream.getChannel();
    fileChannel.transferFrom(readableByteChannel, 0, Long.MAX_VALUE);

    fileOutputStream.close();
  }

private static void yamlConversionToJson(String yamlString, String filePath) {
  ObjectMapper yamlReader = new ObjectMapper(new YAMLFactory());
  Object obj = null;

  try {
    obj = yamlReader.readValue(yamlString, Object.class);
  } catch (JsonMappingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  } catch (JsonProcessingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }

  SaveFormattedJson(obj, filePath);
}

private static void SaveFormattedJson(Object jsonObject, String filePath) {
  try {
    ObjectWriter writer = new ObjectMapper().writerWithDefaultPrettyPrinter();
    writer.writeValue(new File(filePath + ".json"), jsonObject);
    // Used a current version of json for use with SwaggerCoverage of current karate run
    writer.writeValue(new File("target/swaggers/current.json"), jsonObject);
  } catch (IOException e) {
    e.printStackTrace();
  }
}