Add `plotly_static` `async` API #72

Job	Run time
Rustfmt	17s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 25s
Clippy	2m 36s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	2m 36s
Code Coverage	13s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 36s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	2m 24s
Build Wasm Examples (basic)	1m 11s
Build Examples (basic_charts)	35s
Build Wasm Examples (callback-example)	55s
semver	46s
Build Examples (3d_charts)	36s
Build Examples (customization/multiple_plots_example)	35s
Build Examples (customization/consistent_static_format_export)	1m 25s
Build Book	2m 34s
Build Examples (customization/density_mapbox_example)	29s
Build Examples (images)	52s
Build Examples (scientific_charts)	30s
Build Examples (kaleido)	1m 14s
Build Examples (themes)	28s
Build Examples (shapes)	52s
Build Examples (ndarray)	26s
Build Examples (financial_charts)	33s
Build Examples (custom_controls)	38s
Build Examples (subplots)	31s
Build Examples (maps)	48s
Build Examples (statistical_charts)	38s
	29m 43s

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