Add Choropleth and ChoroplethMap trace types #229

Job	Run time
Code Coverage	16s
Build Book	4m 25s
Rustfmt	14s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	8m 24s
Clippy	5m 44s
semver	58s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 57s
Build Examples (subplots)	37s
Build Wasm Examples (basic)	1m 3s
Build Wasm Examples (callback-example)	1m 5s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 21s
Build Examples (custom_controls)	37s
Build Examples (customization/consistent_static_format_export)	1m 41s
Build Examples (customization/density_mapbox_example)	25s
Build Examples (ndarray)	34s
Build Examples (shapes)	34s
Build Examples (maps)	44s
Build Examples (3d_charts)	35s
Build Examples (customization/multiple_plots_example)	36s
Build Examples (scientific_charts)	25s
Build Examples (statistical_charts)	34s
Build Examples (images)	58s
Build Examples (financial_charts)	21s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 19s
Build Examples (kaleido)	1m 21s
Build Examples (basic_charts)	30s
Build Examples (themes)	34s
	44m 52s

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