make 'online_cdn_js' function public as well #658

Job	Run time
Clippy	3m 12s
semver	48s
Rustfmt	13s
Tests (ubuntu-latest)	2m 29s
Tests (macos-latest)	3m 48s
Code Coverage	19s
Tests (windows-latest)	3m 30s
Build Wasm Examples (callback-example)	57s
Build Book	1m 43s
Build Wasm Examples (basic)	55s
Build Examples (basic_charts)	36s
Build Examples (custom_controls)	34s
Build Examples (images)	49s
Build Examples (3d_charts)	35s
Build Examples (financial_charts)	35s
Build Examples (customization)	33s
Build Examples (maps)	44s
Build Examples (subplots)	31s
Build Examples (scientific_charts)	33s
Build Examples (ndarray)	34s
Build Examples (shapes)	34s
Build Examples (kaleido)	1m 35s
Build Examples (themes)	34s
	26m 41s

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