add Icicle, Indicator and Histogram2d examples #272

Job	Run time
Code Coverage	9s
Rustfmt	16s
semver	59s
Build Examples (scientific_charts)	31s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 51s
Build Book	3m 23s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 23s
Build Examples (ndarray)	26s
Build Wasm Examples (callback-example)	57s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 36s
Build Examples (themes)	32s
Build Examples (statistical_charts)	36s
Build Examples (images)	53s
Clippy	5m 35s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 33s
Build Examples (shapes)	38s
Build Wasm Examples (basic)	1m 4s
Build Examples (3d_charts)	27s
Build Examples (basic_charts)	35s
Build Examples (customization/consistent_static_format_export)	1m 36s
Build Examples (subplots)	25s
Build Examples (kaleido)	1m 20s
Build Examples (customization/density_mapbox_example)	27s
Build Examples (financial_charts)	36s
Build Examples (maps)	40s
Build Examples (custom_controls)	33s
Build Examples (customization/multiple_plots_example)	26s
	42m 27s

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