Add a way to access color arrays from ODSCharts object

[louismaximepiton]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Propose a way for people to use for exampleODSCharts.CategoricalColors.supportingColors.color[3] or maybe something more convenient to access the colors defined in the Orange dataviz palette.

Motivation and context

Avoid using hex codes of Orange colors such as in this example, in the dataOptions.series.itemStyle.color.