feat(behavior): support touch event for drag-canvas #6626
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@Aarebecca 不能每个交互都来一个 touch 版本，而是应该默认支持移动端，G2 是可以的，可以看看是做了啥逻辑？ |
理论上来说 G6 使用的 pointer 事件是可以适应移动端触控交互的，不过实际测试上却发现存在问题 |
因为Pointer事件回调函数有的参数返回为空，导致的不适配。比如拖拽事件使用的 |
这个是现状，如果是问题还是得解决。 看看 G2 是否存在类似的问题吧，如果也没有可以参考，如果有也需要改底层。否则全部新增一遍，后面还是会有一个工作，就是合并，到时候删除就不想新增那么简单了，全是 break change。 |
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support touch event for drag-canvas