fix hovertext dimension to be matrix / 2d array type (#387) #155

Job	Run time
Code Coverage	22s
semver	52s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 26s
Clippy	4m 44s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 46s
Build Wasm Examples (callback-example)	57s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 28s
Build Book	3m 49s
Rustfmt	15s
Build Wasm Examples (basic)	56s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 18s
Build Examples (customization/consistent_static_format_export)	1m 41s
Build Examples (custom_controls)	36s
Build Examples (3d_charts)	36s
Build Examples (customization/multiple_plots_example)	36s
Build Examples (financial_charts)	36s
Build Examples (themes)	34s
Build Examples (images)	55s
Build Examples (maps)	44s
Build Examples (ndarray)	36s
Build Examples (shapes)	35s
Build Examples (basic_charts)	35s
Build Examples (customization/density_mapbox_example)	32s
Build Examples (kaleido)	1m 26s
Build Examples (statistical_charts)	35s
Build Examples (scientific_charts)	35s
Build Examples (subplots)	33s
	41m 38s

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