customColors property
Extends from CirclesBackground
All the parameters like sampleRedColors or sampleData are static because the user can use them if he wants.
There are some parameters I didn't want the user to use like _getColor
If you chose GradientColor.custom you need to provide customColors for the circles
Implementation
///If you chose [GradientColor.custom] you need to provide [customColors] for the circles
final List<List<Color>>? customColors;