Tree's loadData event cannot be triggered by expandedKeys? and want to expose the loadingKeys property

[xiaosongmao123]

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

Version

3.2.6

Environment

edge 102

Reproduction link

https://www.antdv.com/components/tree-cn#API

Steps to reproduce

Tree,设置了loadData，expandedKeys 属性

1.点击node前面的箭头图标时会触发loadData事件，加载子节点

2.使用代码自动设置expandedKeys.value=[nodekey]时，不会触发loadData事件，不会加载子节点

What is expected?

.使用代码自动设置expandedKeys.value=[nodekey]时，节点展开，同时触发loadData

What is actually happening?

节点可以展开，但不会触发loadData事件，不会加载子节点

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另外，看了一下vctree，是有公开loadingKeys属性的，tree没有公开，只是公开了公开loadedKeys属性。

但有特殊需求，我想要自己控制node节点显示加载中状态（不关心子节点，只是为了显示loading效果，给用户一个提示。之后会在settimeout里清除loadingKeys）,所以希望可以公开loadingKeys属性，支持手动设置

[tangjinzhou]

1、可以手动去调用 loadData 绑定的函数
2、可以自定义icon 去解决
3、不同问题请分开提问

[github-actions]

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