Column Chart Grouped and Stacked

[saifidrees]

Describe the solution you'd like
I want to show data in Stacked Column chart with different series grouped together as shown in attached picture

And there is no option to mention Group in Series.java see the screenshow

[Loahrs]

I created a PR to add another constructor and added a field for property "group".

This makes it possible to create something like this: https://apexcharts.com/javascript-chart-demos/column-charts/grouped-stacked-columns/

ApexCharts chart = ApexChartsBuilder.get()
                .withSeries(new Series<>("Q1 Budget","budget", 44000, 55000, 41000, 67000, 22000, 43000),
                        new Series<>("Q1 Actual","actual",  48000, 50000, 40000, 65000, 25000, 40000),
                        new Series<>("Q2 Budget","budget",  13000, 36000, 20000, 8000, 13000, 27000),
                        new Series<>("Q2 Actual","actual",  20000, 40000, 25000, 10000, 12000, 28000)
                )
                .withChart(ChartBuilder.get()
                        .withType(Type.BAR)
                        .withStacked(true)
                        .withHeight("350")
                        .build())
                .withStroke(StrokeBuilder.get()
                        .withColors("#fff")
                        .withWidth(1.0)
                        .build())
                .withDataLabels(DataLabelsBuilder.get()
                        .withFormatter("""
                                (val) => {
                                    return val / 1000 + "K"
                                }
                                """)
                        .build())
                .withPlotOptions(PlotOptionsBuilder.get()
                        .withBar(BarBuilder.get()
                                .withHorizontal(false)
                                .build())
                        .build())
                .withXaxis(XAxisBuilder.get().withCategories(
                        "Online advertising",
                        "Sales Training",
                        "Print advertising",
                        "Catalogs",
                        "Meetings",
                        "Public relations").build())
                .withFill(FillBuilder.get()
                        .withOpacity(1.0).build())
                .withColors("#80c7fd", "#008FFB", "#80f1cb", "#00E396")
                .withYaxis(YAxisBuilder.get()
                        .withLabels(LabelsBuilder.get()
                                .withFormatter("""
                                        (val) => { return (val / 1000) + "K" }
                                        """)
                                .build())
                        .build())
                .withLegend(LegendBuilder.get()
                        .withPosition(Position.TOP)
                        .withHorizontalAlign(HorizontalAlign.LEFT)
                        .build())
                .build();