[Feature] histogram support `barPadding`

[xile611]

What problem does this feature solve?

What does the proposed API look like?

interface IHistogramChartSpec {
  barPadding?: number;
}

[Runtus]

我想认领这个issue

[xile611]

@Runtus 可以参考这个文档： https://github.com/VisActor/VChart/blob/develop/CONTRIBUTING.zh-CN.md 欢迎参与VChart的开源贡献

[xile611]

@Runtus 这个issue有进展吗

[Runtus]

@Runtus 这个issue有进展吗

有的有的，不好意思，前段时间忙实习和秋招，我这两天把之前修的提PR上来