Add Choropleth and ChoroplethMap trace types #214

Job	Run time
Rustfmt	14s
semver	20s
Code Coverage	20s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	23s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	21s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	25s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	20s
Build Book	28s
Build Wasm Examples (callback-example)	33s
Build Examples (customization/density_mapbox_example)	32s
Build Examples (basic_charts)	33s
Build Examples (3d_charts)	33s
Build Examples (custom_controls)	33s
Build Wasm Examples (basic)	33s
Build Examples (customization/consistent_static_format_export)	33s
Build Examples (shapes)	33s
Build Examples (maps)	34s
Build Examples (customization/multiple_plots_example)	32s
Build Examples (subplots)	33s
Build Examples (themes)	33s
Build Examples (statistical_charts)	33s
Build Examples (financial_charts)	33s
Build Examples (scientific_charts)	34s
Build Examples (ndarray)	33s
Build Examples (images)	33s
Clippy	24s
Build Examples (kaleido)	33s
	13m 9s

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