text: Title: Extend support for ordinal data type
  Body: Ordinal data are common in rating scales for surveys, as well as attributes like Age or number of years for X. 
  Ordinal data currently gets classified as categorical, especially if the column contains NaN values.
  The [young people survey dataset](https://www.kaggle.com/miroslavsabo/young-people-survey) on Kaggle is a good example of this, since it contains lots of rating scale data. 
  ![image](https://user-images.githubusercontent.com/5554675/105573876-805fad00-5d9b-11eb-8448-49bf0e8b8fe5.png)
  This issue should extend support for ordinal data type detection, as well as better visualizations to display for ordinal data type. For example, ordinal data bar charts should be ordered instead of sorted based on the measure values. In addition, correlation of one or more ordinal attribute would be relevant to show.