feat(editor): support convert edgeless bookmark to embed iframe block (#11237)

Close [BS-2941](https://linear.app/affine-design/issue/BS-2941/白板-surface-中-card-view-无法转为-embed-view)

blocksuite/affine/blocks/block-embed/src/embed-iframe-block/index.ts

@@ -1,5 +1,10 @@
 export * from './adapters';
 export * from './commands';
 export * from './configs';
+export {
+  EMBED_IFRAME_DEFAULT_HEIGHT_IN_SURFACE,
+  EMBED_IFRAME_DEFAULT_WIDTH_IN_SURFACE,
+} from './consts';
 export * from './embed-iframe-block';
 export * from './embed-iframe-spec';
+export { canEmbedAsIframe } from './utils';

blocksuite/affine/blocks/block-embed/src/embed-iframe-block/utils.ts

@@ -1,3 +1,9 @@
+import {
+  EmbedIframeService,
+  FeatureFlagService,
+} from '@blocksuite/affine-shared/services';
+import type { BlockStdScope } from '@blocksuite/block-std';
+
 /**
  * The options for the embed iframe url validation
  */
@@ -59,3 +65,16 @@ export function safeGetIframeSrc(htmlString: string): string | undefined {
     return undefined;
   }
 }
+
+/**
+ * Check if the url can be embedded as an iframe
+ * @param std The block std scope
+ * @param url The url to check
+ * @returns Whether the url can be embedded as an iframe
+ */
+export function canEmbedAsIframe(std: BlockStdScope, url: string) {
+  const featureFlag = std.get(FeatureFlagService);
+  const isEmbedIframeEnabled = featureFlag.getFlag('enable_embed_iframe_block');
+  const embedIframeService = std.get(EmbedIframeService);
+  return isEmbedIframeEnabled && embedIframeService.canEmbed(url);
+}