perf: 优化tree getIcon方法类型定义

src/components/Tree/src/BasicTree.vue

@@ -110,7 +110,7 @@ export default defineComponent({
       getSelectedNode
     } = useTree(treeDataRef, getFieldNames)
 
-    function getIcon(params: Recordable, icon?: string) {
+    function getIcon(params: TreeItem, icon?: string) {
       if (!icon) {
         if (props.renderIcon && isFunction(props.renderIcon)) {
           return props.renderIcon(params)