add Choropleth and ChoroplethMap trace types #230

Job	Run time
Build Wasm Examples (basic)	1m 3s
Rustfmt	14s
Build Book	4m 8s
Build Wasm Examples (callback-example)	1m 6s
Clippy	5m 48s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 54s
Code Coverage	18s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	5m 32s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 27s
Build Examples (basic_charts)	38s
Build Examples (shapes)	1m 0s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 19s
Build Examples (financial_charts)	29s
Build Examples (3d_charts)	39s
semver	58s
Build Examples (images)	55s
Build Examples (custom_controls)	34s
Build Examples (maps)	53s
Build Examples (kaleido)	1m 25s
Build Examples (scientific_charts)	33s
Build Examples (themes)	36s
Build Examples (statistical_charts)	36s
Build Examples (ndarray)	35s
Build Examples (customization/multiple_plots_example)	33s
Build Examples (subplots)	32s
Build Examples (customization/consistent_static_format_export)	1m 42s
Build Examples (customization/density_mapbox_example)	33s
	46m 0s

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