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Colorscale/colorbar fixes for Plotly backend (#3590)

* For plotly backend reduce colorscale length to <= 255 to work around
https://github.com/plotly/plotly.js/issues/3699. Plotly.js performs
colorscale interpolation internally so reducing the number of colors
here makes very little difference to the displayed colorscale.

* When falling back to a plotly.py colorscale, return scale as-is

previously an invalid colorscale was being constructed because the
colorscale list of pairs was treated as if it were a list of colors

* Fix edges_color and colorbar options for Plotly trisurf element

* Add colorbar/colorscale configuration to plotly bivariate element

* Add colorbar plotly tests

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