fix(button): fix: add button click type's defination (#2026)

Co-authored-by: tujin_li <tujin.li@gshopper.com>

packages/button/src/button.vue

@@ -108,7 +108,7 @@ export default defineComponent({
     })
 
     //methods
-    const handleClick = evt => {
+    const handleClick = (evt: MouseEvent) => {
       emit('click', evt)
     }