didi / didi/LogicFlow

[Feature]: 连线支持在路径中间显示箭头

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core: edge status: todo type:feature-require
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Description

### 背景&目的

源码中只支持在连线头尾显示箭头,无法在连线中间显示箭头。

现在只有 `getStartArrow` 和 `getEndArrow`,希望增加 `getMidArrow`。

可以参照 [svg marker](https://developer.mozilla.org/zh-CN/docs/Web/SVG/Element/marker)

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