Consider adding `AnnotatedServiceConfig` about armeria HOT 1 OPEN

public abstract class ServiceConfig { 
     // Add this abstract method. 
    public <E, T> T getSpecificValue(E field, Class<T> type);
     ...
}

// Add this enum
public enum AnnotedServiceField {
  Method, 
  ServiceObject, 
  DefaultStatus,
  ...
}

public class AnnotatedService { 
  
  ...
  // Add this method.
  public Map<AnnotatedServiceField, Object> fieldsToMap(){ 
    final Map<AnnotatedServiceField, Object> maps = Arrays.stream(AnnotatedServiceField.values())
              .collect(Collectors.toMap(v -> v, v -> null));
    
    ...
    maps.put(AnnotatedServiceField.HttpStatus, this.httpStatus);
    maps.put(AnnotatedServiceField.Method, this.method);
    ...

   return maps;
  } 
...
}

public class AnnotatedServiceConfig extends ServiceConfig {

  ...
  // add this methods.
  private final Map<AnnotatedServiceField, Object> specificConfig;
  public T getSpecificValue(AnnotatedServiceField field, Class<T> type){
      Object field = specifigConfig.get(field);
      return (type) field;
  }
  ...

}

public class ServiceConfigBuilder implements ServiceConfigSetters {
    ServiceConfig build(...) {
        final Map<AnnotatedServiceField, Object> specificFields = service.fieldsToMap()   // Add this code.
        ServiceErrorHandler errorHandler =
                serviceErrorHandler != null ? serviceErrorHandler.orElse(defaultServiceErrorHandler)
                                            : defaultServiceErrorHandler;
        ...
    }
}