内嵌iframe页支持设置keepAlive，保持页面状态 (#873)

* pref: keep alive iframe

* pref: default maxCount is 10 item

* pref: 渲染iframe时，移除默认的slot渲染frameView组件

* perf: fix frame reload error after hmr

* perf: 通过路由配置keepAlive frame

* perf: refresh keep alive iframe

mock/asyncRoutes.ts

@@ -118,6 +118,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsEpDocument",
             frameSrc: "https://element-plus.org/zh-CN/",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         },
@@ -127,6 +128,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsTailwindcssDocument",
             frameSrc: "https://tailwindcss.com/docs/installation",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         },
@@ -136,6 +138,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsVueDocument",
             frameSrc: "https://cn.vuejs.org/",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         },
@@ -145,6 +148,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsViteDocument",
             frameSrc: "https://cn.vitejs.dev/",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         },
@@ -154,6 +158,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsPiniaDocument",
             frameSrc: "https://pinia.vuejs.org/zh/index.html",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         },
@@ -163,6 +168,7 @@ const frameRouter = {
           meta: {
             title: "menus.hsRouterDocument",
             frameSrc: "https://router.vuejs.org/zh/",
+            keepAlive: true,
             roles: ["admin", "common"]
           }
         }