Add base map support

[wybert]

What problem does this feature solve?

Add basemap for maps. For now it only support baidu map, but it should easily to have different base maps such as open street map etc. or any available XYZ services offering raster basemap tiles.

What does the proposed API look like?

I would like have to some options like basemap = "baidu map", or basemap="open street map" or basemap="https://{s}.basemaps.cartocdn.com/rastertiles/voyager/{z}/{x}/{y}.png"

[helgasoft]

Besides the built-in bmap there are three ECharts extensions:

• gmap for Google maps, see demo code
• AMap for Gaode maps, see demo code
• leaflet, abandoned project but works if fixed, see demo code, supports "any available XYZ services".

[wybert]

It seems the demo code for the leaflet doesn't work

[helgasoft]

fixed, works now

[github-actions]

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