feat(editor): add idle status for embed iframe block (#11142)

To close:
[BS-2843](https://linear.app/affine-design/issue/BS-2843/iframe-embed-block-占位态)
[BS-2844](https://linear.app/affine-design/issue/BS-2844/iframe-embed-block-create-modal-ui-调整)
[BS-2880](https://linear.app/affine-design/issue/BS-2880/spotify-选中时圆角有问题)
[BS-2881](https://linear.app/affine-design/issue/BS-2881/miro-圆角有问题-点击-see-the-board-加载之后就好了)

blocksuite/affine/shared/src/services/embed-iframe/embed-iframe-config.ts

@@ -26,6 +26,7 @@ export type IframeOptions = {
   scrolling?: boolean;
   allow?: string;
   allowFullscreen?: boolean;
+  containerBorderRadius?: number;
 };
 
 /**