feat(editor): allow embedding any iframes (#12895)

fix BS-3606




#### PR Dependency Tree


* **PR #12892**
  * **PR #12895** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Introduced support for embedding generic iframes with customizable
dimensions and permissions, while ensuring only secure, non-AFFiNE URLs
are allowed.
* Enhanced embedding options by prioritizing custom embed blocks over
iframe blocks for a richer embedding experience across toolbars and link
actions.
* Added URL validation to support secure and flexible embedding
configurations.

* **Bug Fixes**
* Improved iframe embedding reliability by removing restrictive HTTP
headers and certain Content Security Policy directives that could block
iframe usage in the Electron app.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/embed/src/common/utils.ts

@@ -11,6 +11,8 @@ import {
   EmbedCardLightVerticalIcon,
 } from '@blocksuite/affine-components/icons';
 import { ColorScheme } from '@blocksuite/affine-model';
+import { EmbedOptionProvider } from '@blocksuite/affine-shared/services';
+import type { BlockStdScope } from '@blocksuite/std';
 import type { TemplateResult } from 'lit';
 
 type EmbedCardIcons = {
@@ -40,3 +42,8 @@ export function getEmbedCardIcons(theme: ColorScheme): EmbedCardIcons {
     };
   }
 }
+
+export function canEmbedAsEmbedBlock(std: BlockStdScope, url: string) {
+  const options = std.get(EmbedOptionProvider).getEmbedBlockOptions(url);
+  return options?.viewType === 'embed';
+}