vertical Bi Convex Bar
fun <X> XYGraphScope<X, Float>.verticalBiConvexBar(color: Color, border: BorderStroke? = null): DefaultVerticalBarComposable<X, Float>
Factory function to create a Composable that emits a solid colored bar. Each bar features a convex shape on both its starting and ending sides. There's an additional convex cutout at the bottom of the bar.