Add `plotly_static` `async` API #75

Job	Run time
Clippy	3m 51s
Rustfmt	15s
semver	50s
Build Wasm Examples (callback-example)	1m 2s
Build Wasm Examples (basic)	1m 5s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 19s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 7s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 28s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 4s
Code Coverage	11s
Build Book	3m 18s
Build Examples (3d_charts)	35s
Build Examples (customization/consistent_static_format_export)	1m 20s
Build Examples (custom_controls)	38s
Build Examples (basic_charts)	28s
Build Examples (subplots)	31s
Build Examples (customization/density_mapbox_example)	34s
Build Examples (maps)	39s
Build Examples (themes)	31s
Build Examples (financial_charts)	34s
Build Examples (shapes)	37s
Build Examples (ndarray)	34s
Build Examples (statistical_charts)	43s
Build Examples (kaleido)	1m 17s
Build Examples (customization/multiple_plots_example)	30s
Build Examples (scientific_charts)	30s
Build Examples (images)	47s
	36m 18s

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