Add New-ChartLabel (or similar) allowing to define labels in Donut/Pie Charts

[PrzemyslawKlys]

It's possible in ApexCharts

• https://apexcharts.com/docs/chart-types/pie-donut/

This most likely requires a new cmdlet to be created and tested.

Originally posted by @PrzemyslawKlys in #173 (comment)

[PrzemyslawKlys]

Closed by PR #525, which added New-ChartLabel/ChartLabel for pie/donut label overrides, with docs, examples, and tests.