better support for lines on maps in Plotly Express

Today, px.line_mapbox and px.line_geo expect rows which are points, which are then split into groups and connected by lines.

In most GIS formats, however, as wrapped by GeoPandas, the entire line feature is often stored in a single row, just like choropleth geometries. We should have either a new pair of PX functions for this (px.line_feature_mapbox?) or an option to the existing functions (px.line_mapbox(geojson=<geojson>)) to support this option out of the box.

先檢視現有的 px.line_mapbox 和 px.line_geo 入口點，以及它們如何將列解讀為點。將該行為與 GeoPandas 和 GIS 格式中的單列線圖徵進行比較。完成的要求是確定一項各方同意的設計——新增 PX 函式或在現有函式上提供選項——並在預設情況下支援這些線圖徵。