Add `plotly_static` `async` API #77

Job	Run time
Clippy	3m 58s
Rustfmt	14s
semver	50s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 58s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 17s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 3s
Code Coverage	12s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 55s
Build Wasm Examples (callback-example)	55s
Build Wasm Examples (basic)	48s
Build Book	3m 39s
Build Examples (custom_controls)	34s
Build Examples (basic_charts)	33s
Build Examples (customization/density_mapbox_example)	29s
Build Examples (customization/consistent_static_format_export)	1m 36s
Build Examples (3d_charts)	33s
Build Examples (maps)	40s
Build Examples (customization/multiple_plots_example)	42s
Build Examples (financial_charts)	38s
Build Examples (scientific_charts)	29s
Build Examples (kaleido)	1m 28s
Build Examples (images)	49s
Build Examples (statistical_charts)	38s
Build Examples (shapes)	35s
Build Examples (ndarray)	37s
Build Examples (themes)	39s
Build Examples (subplots)	28s
	39m 17s

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