Include Plotly Python Library

[rana_khalid]

I would love to see Plotly introduced as one of the python libraries included to make key visualizations. For example, sankey charts and chord charts are very easy to create using plotly and come out looking much nicer than the packages provided through PowerBI. The library also can support many other graphs which would really increase the usability of PowerBI for data scientists and others that are trying to visualize their data in unique ways.