feat: Add Violin trace type with box, mean line, KDE span, and split/… #225

Job	Run time
Build Wasm Examples (basic)	1m 3s
Code Coverage	20s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 22s
semver	1m 1s
Rustfmt	16s
Build Examples (customization/multiple_plots_example)	35s
Build Examples (customization/density_mapbox_example)	35s
Build Examples (customization/consistent_static_format_export)	1m 47s
Build Examples (3d_charts)	37s
Build Wasm Examples (callback-example)	1m 2s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	8m 12s
Build Book	4m 6s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 22s
Build Examples (basic_charts)	36s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 19s
Clippy	5m 38s
Build Examples (images)	57s
Build Examples (custom_controls)	34s
Build Examples (kaleido)	1m 35s
Build Examples (financial_charts)	42s
Build Examples (ndarray)	34s
Build Examples (maps)	44s
Build Examples (statistical_charts)	33s
Build Examples (themes)	32s
Build Examples (scientific_charts)	33s
Build Examples (subplots)	34s
Build Examples (shapes)	34s
	43m 43s

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