Add Choropleth and ChoroplethMap trace types #215

Job	Run time
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 22s
Build Examples (customization/consistent_static_format_export)	1m 48s
Build Examples (statistical_charts)	37s
semver	1m 6s
Build Examples (images)	55s
Build Examples (custom_controls)	38s
Code Coverage	25s
Build Examples (ndarray)	36s
Build Examples (shapes)	42s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 35s
Build Book	4m 21s
Build Wasm Examples (basic)	1m 3s
Build Examples (basic_charts)	40s
Build Examples (3d_charts)	40s
Build Examples (customization/multiple_plots_example)	39s
Clippy	4m 56s
Rustfmt	16s
Build Examples (themes)	36s
Build Examples (subplots)	32s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 35s
Build Examples (scientific_charts)	36s
Build Examples (customization/density_mapbox_example)	34s
Build Wasm Examples (callback-example)	1m 2s
Build Examples (kaleido)	1m 16s
Build Examples (maps)	44s
Build Examples (financial_charts)	37s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 5s
	42m 56s

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