提供Prism类，实现棱柱的绘制。可以通过API设置底面坐标、高度、侧面颜色、顶面颜色、侧面纹理。

let prism = new Prism({
  points: [new LatLng(30, 110), new LatLng(30, 110.02), new LatLng(29.985, 110.02),
      new LatLng(29.985, 110)],
  height: 600,
  topFaceColor: 'rgba(17, 29, 234,0.6)',
  sideFaceColor: 'rgba(17, 29, 234,1)',
})
this.mapController.addOverlay(prism);

let prism2 = new Prism({
    points: [new LatLng(30+0.05, 110), new LatLng(30+0.05, 110.02),
        new LatLng(29.985+0.05, 110)],
      height: 500,
      topFaceColor: 'rgba(255, 0, 0, 0.5)',
      sideFaceColor: 'rgba(255, 0, 0, 0.7)',
})


this.mapController.addOverlay(prism2);