Add `plotly_static` `async` API #76

Job	Run time
Clippy	3m 58s
Rustfmt	15s
semver	47s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 20s
Build Book	3m 53s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 29s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	6m 27s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 4s
Build Wasm Examples (basic)	1m 8s
Code Coverage	10s
Build Wasm Examples (callback-example)	49s
Build Examples (images)	44s
Build Examples (custom_controls)	32s
Build Examples (customization/multiple_plots_example)	30s
Build Examples (basic_charts)	32s
Build Examples (themes)	37s
Build Examples (kaleido)	1m 20s
Build Examples (statistical_charts)	30s
Build Examples (financial_charts)	29s
Build Examples (subplots)	30s
Build Examples (scientific_charts)	30s
Build Examples (shapes)	32s
Build Examples (maps)	48s
Build Examples (customization/density_mapbox_example)	36s
Build Examples (3d_charts)	35s
Build Examples (customization/consistent_static_format_export)	1m 21s
Build Examples (ndarray)	33s
	38m 59s

Provide feedback