Add `plotly_static` `async` API #69

Job	Run time
Clippy	4m 2s
Rustfmt	15s
Build Book	3m 40s
semver	40s
Build Wasm Examples (basic)	54s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 22s
Code Coverage	19s
Build Wasm Examples (callback-example)	55s
Build Examples (basic_charts)	34s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 31s
Build Examples (3d_charts)	37s
Build Examples (customization/consistent_static_format_export)	1m 42s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 22s
Build Examples (customization/multiple_plots_example)	1m 5s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	4m 30s
Build Examples (scientific_charts)	29s
Build Examples (maps)	55s
Build Examples (kaleido)	1m 26s
Build Examples (images)	1m 1s
Build Examples (custom_controls)	36s
Build Examples (ndarray)	31s
Build Examples (statistical_charts)	37s
Build Examples (customization/density_mapbox_example)	44s
Build Examples (financial_charts)	35s
Build Examples (shapes)	38s
Build Examples (subplots)	33s
Build Examples (themes)	32s
	38m 5s

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