fix: add tree-select types

Author: tangjinzhou

types/tree-select.d.ts

@@ -85,6 +85,10 @@ export declare class TreeSelect extends AntdComponent {
    */
   loadData: (node: any) => void;
 
+  maxTagCount: number;
+
+  maxTagPlaceholder: any;
+
   /**
    * Support multiple or not, will be true when enable treeCheckable.
    * @default false