feat(表格): 分组表头支持固定（vueComponent#3882）

Author: MrSmallLiu

components/table/ColumnGroup.tsx

@@ -1,9 +1,13 @@
 import { defineComponent } from 'vue';
-import PropTypes from '../_util/vue-types';
+import PropTypes, { withUndefined } from '../_util/vue-types';
+import { tuple } from '../_util/type';
 
 export default defineComponent({
   name: 'ATableColumnGroup',
   props: {
+    fixed: withUndefined(
+      PropTypes.oneOfType([PropTypes.looseBool, PropTypes.oneOf(tuple('left', 'right'))]),
+    ),
     title: PropTypes.any,
   },
   __ANT_TABLE_COLUMN_GROUP: true,