Add Splom and Parcats trace types #248

Job	Run time
Build Wasm Examples (callback-example)	1m 6s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 8s
Clippy	6m 14s
semver	50s
Build Wasm Examples (basic)	1m 7s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 34s
Rustfmt	14s
Code Coverage	17s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 46s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	16s
Build Book	4m 24s
Build Examples (themes)	35s
Build Examples (financial_charts)	37s
Build Examples (images)	1m 6s
Build Examples (kaleido)	1m 35s
Build Examples (ndarray)	40s
Build Examples (scientific_charts)	33s
Build Examples (customization/consistent_static_format_export)	1m 50s
Build Examples (customization/density_mapbox_example)	33s
Build Examples (maps)	49s
Build Examples (basic_charts)	37s
Build Examples (customization/multiple_plots_example)	33s
Build Examples (custom_controls)	38s
Build Examples (3d_charts)	37s
Build Examples (statistical_charts)	37s
Build Examples (shapes)	33s
Build Examples (subplots)	33s
	38m 22s

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