Add `plotly_static` `async` API #80

Job	Run time
Clippy	6m 50s
Rustfmt	15s
Build Book	3m 29s
semver	36s
Code Coverage	10s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 10s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 10s
Build Wasm Examples (callback-example)	54s
Build Wasm Examples (basic)	53s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 34s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 3s
Build Examples (basic_charts)	32s
Build Examples (maps)	40s
Build Examples (3d_charts)	27s
Build Examples (kaleido)	1m 13s
Build Examples (images)	40s
Build Examples (shapes)	39s
Build Examples (customization/consistent_static_format_export)	1m 30s
Build Examples (ndarray)	40s
Build Examples (statistical_charts)	32s
Build Examples (customization/multiple_plots_example)	28s
Build Examples (scientific_charts)	48s
Build Examples (customization/density_mapbox_example)	23s
Build Examples (custom_controls)	27s
Build Examples (financial_charts)	37s
Build Examples (themes)	26s
Build Examples (subplots)	29s
	38m 35s

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