feat: Add {x,y}gap parameter to heatmaps (#385) #152

Job	Run time
Rustfmt	14s
Build Wasm Examples (callback-example)	1m 0s
Build Book	4m 32s
Code Coverage	12s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 13s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	5m 52s
Build Wasm Examples (basic)	50s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 30s
Clippy	4m 52s
semver	53s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	4m 9s
Build Examples (customization/density_mapbox_example)	46s
Build Examples (subplots)	53s
Build Examples (financial_charts)	35s
Build Examples (customization/consistent_static_format_export)	1m 43s
Build Examples (basic_charts)	29s
Build Examples (shapes)	38s
Build Examples (customization/multiple_plots_example)	53s
Build Examples (3d_charts)	46s
Build Examples (maps)	39s
Build Examples (images)	56s
Build Examples (statistical_charts)	42s
Build Examples (themes)	27s
Build Examples (ndarray)	27s
Build Examples (kaleido)	1m 24s
Build Examples (custom_controls)	42s
Build Examples (scientific_charts)	52s
	46m 9s

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