Add `plotly_static` `async` API #70

Job	Run time
Clippy	4m 8s
Rustfmt	14s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 52s
Code Coverage	23s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	21m 27s
Build Wasm Examples (basic)	57s
semver	45s
Build Book	3m 33s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 12s
Build Wasm Examples (callback-example)	53s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 22s
Build Examples (custom_controls)	36s
Build Examples (customization/multiple_plots_example)	26s
Build Examples (customization/consistent_static_format_export)	1m 33s
Build Examples (images)	45s
Build Examples (ndarray)	32s
Build Examples (financial_charts)	29s
Build Examples (statistical_charts)	46s
Build Examples (shapes)	33s
Build Examples (basic_charts)	48s
Build Examples (3d_charts)	43s
Build Examples (subplots)	35s
Build Examples (kaleido)	1m 24s
Build Examples (maps)	44s
Build Examples (scientific_charts)	37s
Build Examples (customization/density_mapbox_example)	31s
Build Examples (themes)	33s
	53m 21s

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