柱状图坐标系label没有找到旋转属性

[ZhangLinkang]

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What problem does this feature solve?

3.x都有旋转设置，4.x没旋转设置，导致标题过长会出现覆盖显示的情况

What does the proposed API look like?

加上一个旋转属性，设置角度