feat(bar chart): make barGapInGroup percentage based on actual barWidth#3950

xuefei1313 merged 2 commits intoVisActor:feat(bar-chart)-make-barGapInGroup-percentage-based-on-actual-barWidth-#3950VisActor/VChart:feat(bar-chart)-make-barGapInGroup-percentage-based-on-actual-barWidth-#3950from

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