Add `plotly_static` `async` API #64

Job	Run time
Code Coverage	18s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	2m 56s
Clippy	4m 1s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 12s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 11s
Build Book	3m 54s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	14m 34s
Rustfmt	18s
Build Wasm Examples (callback-example)	56s
Build Wasm Examples (basic)	55s
Build Examples (customization/consistent_static_format_export)	1m 29s
semver	47s
Build Examples (3d_charts)	33s
Build Examples (customization/density_mapbox_example)	31s
Build Examples (custom_controls)	33s
Build Examples (kaleido)	1m 21s
Build Examples (basic_charts)	36s
Build Examples (customization/multiple_plots_example)	32s
Build Examples (maps)	48s
Build Examples (financial_charts)	36s
Build Examples (statistical_charts)	41s
Build Examples (images)	47s
Build Examples (shapes)	38s
Build Examples (scientific_charts)	32s
Build Examples (ndarray)	33s
Build Examples (subplots)	32s
Build Examples (themes)	34s
	46m 18s

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