[Feature Request] Support line styles in Scattermapbox

It would be nice to plot lines of different styles, e.g. dashed, dotted, etc. to a Scattermapbox layer. The lack for this feature has been noted here How do I change the line style to dash in a scattermapbox plot?, and here How to change line shape in mapbox maps?

Currently (Plotly 5.18), the only supported line attributes are "color" and "width" . However, distinguishing lines by color is not sufficient for monochrome styled figures. In addition, certain line styles are frequently expected:

• minor roads = dashed line
• under construction = dotted line

从 Scattermapbox 入口点开始，检查其当前的颜色和线宽属性如何传递到渲染过程。检查是否已有 Scattermapbox 渲染测试；done 应包括虚线和点线样式，并提供能够展示所请求用例的覆盖率。该 issue 没有指定具体文件或测试，因此需要探索仓库。