For AI agents: a documentation index is available at /llms.txt. Markdown versions of all pages
are available by appending .md to any URL.
setCircleColorStep
fun MTStyle.setCircleColorStep(layerId: String, key: MTFeatureKey = MTFeatureKey.POINT_COUNT, defaultColor: Int, stops: List<Pair<Double, Int>>, includeAlpha: Boolean = false)