Ensure color, line_color and fill_color are handled consistently in bokeh backend

[philippjfr]

The bokeh backend currently uses color as an alias for either line_color and fill_color. This is both for historical reasons (bokeh used to support it) and because it means that at least the colors can generally be preserved between matplotlib and bokeh. The recent batching code now means that when batched mode is activated only the color options works, overriding options set on line_color or fill_color. We should make sure that this is handled better.

[philippjfr]

We now handle all style options except for the marker on Points/Scatter consistently. This has been discussed in bokeh/bokeh#5884 and it seems they will go down a route of grouping over the datasource, which we already provide.

[github-actions]

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