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

map.save() から開始し、default_js と default_css の依存関係がどのように選択され、エクスポートされた HTML に書き込まれるかを確認します。必要なオプションを定義し、JavaScript、CSS、アイコンがインラインの base64 URI として埋め込まれていることを検証して、生成された地図が外部リソースや相対リソースなしで動作するようにします。