Summary

• Adds a Map chart series (type: "map") so users can render GEO/region maps such as the official USA example without writing a custom SeriesOption.
• Mirrors the structure of existing charts (Funnel/Treemap/Heatmap): origin interfaces under org.icepear.echarts.origin.chart.map.* and Lombok data classes under org.icepear.echarts.charts.map.*, with a MapChart wrapper extending Chart<MapChart, MapSeries>.
• Map-specific extras: MapItemStyle.areaColor, setMap, setRoam (Boolean/String overloads), setLayoutCenter / setLayoutSize, setBoundingCoords, setNameMap, setNameProperty, setProjection, setShowLegendSymbol, setMapValueCalculation, setAspectScale, setGeoIndex.

Public API added

• MapChart
• charts.map.MapSeries, MapDataItem, MapEmphasis, MapItemStyle
• origin.chart.map.MapSeriesOption, MapStateOption, MapEmphasisOption, MapDataItemOption, MapItemStyleOption

Example usage

MapChart chart = new MapChart()
    .setTitle(new Title().setText("USA Population Estimates (2012)").setLeft("right"))
    .setTooltip(new Tooltip().setTrigger("item"))
    .setVisualMap(new ContinousVisualMap().setMin(500_000).setMax(38_000_000)
        .setColor(new String[]{"orangered","yellow","lightskyblue"}).setCalculable(true))
    .addSeries(new MapSeries()
        .setName("USA PopEstimates")
        .setMap("USA")
        .setRoam(true)
        .setItemStyle(new MapItemStyle().setAreaColor("rgb(135, 169, 240)").setBorderColor("#fff"))
        .setEmphasis(new MapEmphasis()
            .setLabel(new SeriesLabel().setShow(true))
            .setItemStyle(new MapItemStyle().setAreaColor("rgb(177, 195, 245)")))
        .setData(new MapDataItem[]{
            new MapDataItem().setName("California").setValue(38041430),
            new MapDataItem().setName("Texas").setValue(26059203),
            // ...
        }));

String json = new EChartsSerializer().toJson(chart.getOption());

Tests added (23 new tests, all passing locally)

• simple/map/BasicMapTest — minimal happy-path snapshot
• advanced/map/UsaMapChartTest — reproduces the issue's USA example
• charts/map/MapSeriesTest — 19 unit tests covering setter overloads (roam Bool/String, layoutSize Number/String, BoxLayout overloads, raw Object data overload), null-omission semantics, areaColor nested under itemStyle, MapEmphasis.disabled, nameMap/nameProperty, boundingCoords, geoIndex, MapChart chaining
• render/simple/RenderMapByChartTest — exercises the Handlebars render Engine end-to-end with the Map chart

Test plan

• mvn test -Dtest=BasicMapTest — 1/1 pass
• mvn test -Dtest=UsaMapChartTest — 1/1 pass
• mvn test -Dtest=MapSeriesTest — 19/19 pass
• mvn test -Dtest=RenderMapByChartTest — 2/2 pass
• mvn test (full suite) — all 23 new tests pass; only the 3 pre-existing float-precision failures (TwoValueAxesInPolar1Test, TwoValueAxesInPolar2Test, BasicPolarLineTest) remain, present on master before this branch and unrelated to this change

Closes #100