Add Enhanced World Map Visual with Labeled Heatmap Support

[Cedrik03]

Power BI would greatly benefit from an world map visual that supports labeled heatmaps. Users should be able to display country-level data with color gradients (for example for growth rates or revenue levels) and see values or percentages directly labeled on the map for each country. This would improve clarity, storytelling, and the ability to present global insights in executive dashboards without the need for tooltips or external legends.