a-tree can't get halfCheckedKeys

[YunRan0526]

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

What problem does this feature solve?

衷心的希望能提供获取半选节点的api， 如果我不点击节点触发事件我就拿不到halfCheckedKeys。很多时候一个界面会有多个tree，在保持父子节点联动的特性的同时我需要在初始化后不操作a-tree组件 就可以直接获取halfCheckedKeys 。后端会将半选节点和全选节点的key一起返回给我，因此必须每次都手动分离。

What does the proposed API look like?

ant-design-vue:1.7.4
下面是我手动筛选节点的方法：贴上来只是想说自己有思考过，但是更期望有更好的解决办法。我自己也看了源码，无奈功力不够 有些无从下手。。。

//userData为一个含有 半选/全选节点 key的数组
function getAllKeys(treeData, userData) {
            let checkedKeys = [];
            let halfCheckedKeys = [];
            function testNode(node) {
                function isfullChecked(node) {
                    if (node?.children?.length) {
                        return node.children.every(res => userData.includes(res.key) && (res?.children?.length ? isfullChecked(res.children) : true));
                    }
                    return true
                }
                isfullChecked(node) ? checkedKeys.push(node.key) : halfCheckedKeys.push(node.key);
            }
            function divideNode(tree) {
                tree.forEach(node => {
                    if (userData.includes(node.key)) {
                        testNode(node);
                    }
                    if (node?.children?.length) {
                        divideNode(node.children)
                    }``
                })
            }
            divideNode(treeData);
            return {
                checkedKeys,
                halfCheckedKeys
            }
        }

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