re-export ImageFormat from plotly_static into plotly package #53

Job	Run time
semver	1m 14s
Code Coverage	12s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 2s
Rustfmt	14s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	4m 34s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	5m 52s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 40s
Clippy	4m 4s
Build Wasm Examples (callback-example)	1m 7s
Build Wasm Examples (basic)	1m 11s
Build Book	3m 46s
Build Examples (maps)	48s
Build Examples (3d_charts)	43s
Build Examples (basic_charts)	34s
Build Examples (scientific_charts)	33s
Build Examples (kaleido)	1m 30s
Build Examples (custom_controls)	34s
Build Examples (statistical_charts)	34s
Build Examples (themes)	34s
Build Examples (customization/consistent_static_format_export)	1m 24s
Build Examples (images)	59s
Build Examples (ndarray)	36s
Build Examples (subplots)	27s
Build Examples (customization/multiple_plots_example)	34s
Build Examples (financial_charts)	33s
Build Examples (customization/density_mapbox_example)	29s
Build Examples (shapes)	31s
	40m 19s

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