PointCloudLayer - 改变点的大小和密度

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const pointCloudRGBRenderer = {
  type: "point-cloud-rgb", // autocasts as new pointCloudRGBRenderer()
  field: "RGB",
  pointSizeAlgorithm: {
    type: "fixed-size",
    useRealWorldSymbolSizes: false,
    size: 10
  },
  pointsPerInch: 15
};