feat: add hover and color-scale support to DensityMapbox #221

Job	Run time
Code Coverage	19s
Rustfmt	13s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	8m 7s
semver	1m 27s
Build Wasm Examples (callback-example)	1m 3s
Build Book	3m 51s
Build Wasm Examples (basic)	48s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 11s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 11s
Clippy	5m 48s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	2m 45s
Build Examples (images)	55s
Build Examples (customization/density_mapbox_example)	31s
Build Examples (custom_controls)	29s
Build Examples (kaleido)	1m 18s
Build Examples (subplots)	33s
Build Examples (ndarray)	34s
Build Examples (customization/consistent_static_format_export)	1m 39s
Build Examples (statistical_charts)	39s
Build Examples (maps)	47s
Build Examples (3d_charts)	35s
Build Examples (basic_charts)	39s
Build Examples (scientific_charts)	32s
Build Examples (financial_charts)	35s
Build Examples (customization/multiple_plots_example)	37s
Build Examples (shapes)	39s
Build Examples (themes)	36s
	42m 21s

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