Support clockwise direction for slices in the Donut Chart

[ramkumarkb]

Hello,

Currently (as per v0.2.0) - it looks like the Donut Chart goes in anti-clockwise direction when displaying the slices. From the Data Viz best practice, Donut slices usuallygo clockwise (starting at 90deg).

Example -
https://www.eea.europa.eu/data-and-maps/daviz/learn-more/chart-dos-and-donts

  #chart.piechart(    
    data,    
    value-key: 1,    
    label-key: 0,    
    radius: 4,    
    slice-style: colors,    
    inner-radius: 1.8,    
    start: 90deg,    
    stop: 450deg,    
    // outset: 0,    
    inner-label: (content: (value, label) => [#text(white, label)], radius: 110%),    
    // inner-label: (content: none),    
    // outer-label: (content: "%", radius: 110%)    
    outer-label: (content: none)    )