Add `plotly_static` `async` API #68

Job	Run time
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	39s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	39s
Rustfmt	17s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	43s
semver	25s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	27s
Clippy	29s
Build Book	26s
Code Coverage	12s
Build Wasm Examples (basic)	38s
Build Wasm Examples (callback-example)	40s
Build Examples (maps)	38s
Build Examples (3d_charts)	32s
Build Examples (kaleido)	39s
Build Examples (customization/consistent_static_format_export)	38s
Build Examples (customization/density_mapbox_example)	31s
Build Examples (customization/multiple_plots_example)	35s
Build Examples (financial_charts)	36s
Build Examples (custom_controls)	32s
Build Examples (themes)	30s
Build Examples (statistical_charts)	38s
Build Examples (subplots)	31s
Build Examples (basic_charts)	38s
Build Examples (scientific_charts)	29s
Build Examples (shapes)	34s
Build Examples (images)	40s
Build Examples (ndarray)	34s
	14m 50s

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