map.save() to support an option to export leaflet dependencies (js/css/icons) as inline base64 uris

Is your feature request related to a problem? Please describe.

folium maps exported as html still depend on external leaflet dependencies (either from internet or on relative paths - manual modification is needed)

Describe the solution you'd like

Something similar to knit in RStudio (which produces the html with the inlined resources). I believe the R leaflet package is self-contained (it contains leaflet's resources), so for this to work in the same manner in folium, additional options to override default_js/default_css may be necessary (i.e. to point them to relative/static paths).

Describe alternatives you've considered

Out of various leaflet wrappers, RStudio's implementation is the closest.

Additional context

(Could attach one of html files created through RStudio's leaflet, if anyone needs it)

Implementation

Possibly, just to gauge the interest for now

从 map.save() 开始，检查如何选择 default_js 和 default_css 依赖项并将其写入导出的 HTML。定义所需的选项，并验证 JavaScript、CSS 和图标是否作为内联 base64 URI 嵌入，以确保生成的地图无需外部或相对资源即可运行。