Automatically add subplot-configured zoom tools when using subcoordinate_y

[droumis]

When creating an overlay with a bunch of subcoordinate_y enabled subplots, a y-zoom tool that operates at the subplot level is needed. This is being implemented in Bokeh with a level arg, e.g. to attach a zoom tool to the subplots on a plot with a single level of nesting you would set the level=1: ywheel_zoom = WheelZoomTool(level=1, dimensions="height")

This feature request is to set up the subplot-enabled zoom tool automatically in HoloViews when subcoordinate_y is invoked.

[github-actions]

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