Add Choropleth and ChoroplethMap trace types #228

Job	Run time
Clippy	1m 46s
Build Book	1m 48s
semver	58s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	1m 46s
Code Coverage	23s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	1m 49s
Rustfmt	16s
Build Wasm Examples (basic)	1m 5s
Build Wasm Examples (callback-example)	1m 3s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	1m 48s
Build Examples (statistical_charts)	35s
Build Examples (shapes)	34s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	1m 46s
Build Examples (subplots)	26s
Build Examples (customization/multiple_plots_example)	42s
Build Examples (3d_charts)	40s
Build Examples (ndarray)	35s
Build Examples (customization/density_mapbox_example)	32s
Build Examples (customization/consistent_static_format_export)	1m 41s
Build Examples (basic_charts)	35s
Build Examples (custom_controls)	29s
Build Examples (scientific_charts)	32s
Build Examples (maps)	42s
Build Examples (images)	57s
Build Examples (kaleido)	1m 18s
Build Examples (financial_charts)	35s
Build Examples (themes)	37s
	25m 58s

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