Add `plotly_static` `async` API #79

Job	Run time
Rustfmt	14s
Clippy	4m 47s
semver	1m 7s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 15s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 4s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 7s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 8s
Build Wasm Examples (callback-example)	50s
Build Wasm Examples (basic)	53s
Code Coverage	10s
Build Book	3m 33s
Build Examples (3d_charts)	31s
Build Examples (basic_charts)	36s
Build Examples (customization/consistent_static_format_export)	1m 42s
Build Examples (kaleido)	1m 14s
Build Examples (custom_controls)	33s
Build Examples (scientific_charts)	28s
Build Examples (images)	52s
Build Examples (statistical_charts)	30s
Build Examples (subplots)	28s
Build Examples (financial_charts)	32s
Build Examples (customization/multiple_plots_example)	29s
Build Examples (customization/density_mapbox_example)	26s
Build Examples (ndarray)	30s
Build Examples (maps)	39s
Build Examples (themes)	29s
Build Examples (shapes)	33s
	37m 40s

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