feat: add lazyContainer comp and demo

src/views/demo/comp/lazy/TargetContent.vue

@@ -0,0 +1,19 @@
+<template>
+  <Card hoverable :style="{ width: '240px', background: '#fff' }">
+    <template #cover>
+      <img alt="example" src="https://os.alipayobjects.com/rmsportal/QBnOOoLaAfKPirc.png" />
+    </template>
+    <CardMeta title="懒加载组件" />
+  </Card>
+</template>
+<script lang="ts">
+  import { defineComponent } from 'vue';
+  import { Card } from 'ant-design-vue';
+
+  export default defineComponent({
+    components: { CardMeta: Card.Meta, Card },
+    setup() {
+      return {};
+    },
+  });
+</script>

src/views/demo/comp/lazy/index.vue

@@ -0,0 +1,46 @@
+<template>
+  <div class="p-4 lazy-base-demo">
+    <Alert message="基础示例" description="向下滚动到可见区域才会加载组件" type="info" show-icon />
+    <div class="lazy-base-demo-wrap">
+      <h1>向下滚动</h1>
+      <LazyContainer @init="() => {}">
+        <TargetContent />
+        <template #skeleton>
+          <Skeleton :rows="10" />
+        </template>
+      </LazyContainer>
+    </div>
+  </div>
+</template>
+<script lang="ts">
+  import { defineComponent } from 'vue';
+  import { Skeleton, Alert } from 'ant-design-vue';
+  import TargetContent from './TargetContent.vue';
+  import { LazyContainer } from '/@/components/Container/index';
+  export default defineComponent({
+    components: { LazyContainer, TargetContent, Skeleton, Alert },
+    setup() {
+      return {};
+    },
+  });
+</script>
+<style lang="less" scoped>
+  .lazy-base-demo {
+    &-wrap {
+      display: flex;
+      width: 50%;
+      height: 2000px;
+      margin: 20px auto;
+      text-align: center;
+      background: #fff;
+      justify-content: center;
+      flex-direction: column;
+      align-items: center;
+    }
+
+    h1 {
+      height: 1300px;
+      margin: 20px 0;
+    }
+  }
+</style>