tree 与 table 组件的拖拽排序的动画效果不一致

[fengyun2]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

tree组件拖拽效果非常生硬带有卡顿的感觉，且拖拽过程中不方便看出是否拖拽到对应的列（效果不够明显），拖拽放置的区域太小，难于操作。

现有效果：

What does the proposed API look like?

tree API保持不变即可，只是优化动画及提升可操作性

优化后的效果：

[github-actions]

Hello @fengyun2. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please send your Pull Request to proper branch (feature branch for the new feature, master for bugfix and other changes), fill the Pull Request Template here, provide changelog/TypeScript/documentation/test cases if needed and make sure CI passed, we will review it soon. We appreciate your effort in advance and looking forward to your contribution!

你好 @fengyun2，我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。请将 Pull Request 发到正确的分支（新特性发到 feature 分支，其他发到 master 分支），务必填写 Pull Request 内的预设模板，提供改动所需相应的 changelog、TypeScript 定义、测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献。