Add testing tool documentation

Author: W1y1r

src/.vuepress/sidebar_timecho/V2.0.x/zh-Table.ts

@@ -102,6 +102,7 @@ export const zhSidebar = {
       children: [
         { text: '命令行工具', link: 'CLI' },
         { text: '监控工具', link: 'Monitor-Tool_timecho' },
+        { text: '测试工具', link: 'Benchmark' },
         { text: '集群管理工具', link: 'Maintenance-Tool_timecho' },
       ],
     },