feat: 添加虚拟表格示例 (#1007)

* feat: 添加虚拟表格示例

src/views/table/high/excel/index.vue

@@ -0,0 +1,18 @@
+<script setup lang="ts">
+import { useColumns } from "./columns";
+
+const { columns, dataList, exportExcel } = useColumns();
+</script>
+
+<template>
+  <div>
+    <el-button
+      type="primary"
+      class="mb-[20px] float-right"
+      @click="exportExcel"
+    >
+      导出
+    </el-button>
+    <pure-table row-key="id" border :data="dataList" :columns="columns" />
+  </div>
+</template>