TreeSelect component could support dropdownVisibleChange event on 1.x

[alwayszb]

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

What problem does this feature solve?

Currently, on version 1.x, TreeSelect component not support dropdownVisibleChange event

What does the proposed API look like?

<a-tree-select @dropdownVisibleChange="xxx" />

[tangjinzhou]

try :dropdownVisibleChange="xxx"

[alwayszb]

https://github.com/vueComponent/ant-design-vue/blob/1.x/components/tree-select/index.jsx
@tangjinzhou In tree-select's source code, did't pass the $attrs, so use dropdownVisibleChange will not work.

const VcTreeSelectProps = {
      props: Object.assign(
        {
          switcherIcon: nodeProps => this.renderSwitcherIcon(prefixCls, nodeProps),
          inputIcon,
          removeIcon: finalRemoveIcon,
          clearIcon: finalClearIcon,
          ...rest,
          showSearch,
          getPopupContainer: getPopupContainer || getContextPopupContainer,
          dropdownClassName: classNames(dropdownClassName, `${prefixCls}-tree-dropdown`),
          prefixCls,
          dropdownStyle: { maxHeight: '100vh', overflow: 'auto', ...dropdownStyle },
          treeCheckable: checkable,
          notFoundContent: notFoundContent || renderEmpty(h, 'Select'),
          __propsSymbol__: Symbol(),
        },
        treeData ? { treeData } : {},
      ),
      class: cls,
      on: { ...getListeners(this), change: this.onChange },
      ref: 'vcTreeSelect',
      scopedSlots: this.$scopedSlots,
    };
return <VcTreeSelect {...VcTreeSelectProps}>{filterEmpty(this.$slots.default)}</VcTreeSelect>;

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