feat(editor): add feature flag for code block html preview (#12397)

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

- **New Features**
  - Introduced an experimental "Code block HTML preview" feature, allowing users to preview HTML within code blocks when enabled.
- **Settings**
  - Added a toggle in experimental features to enable or disable the code block HTML preview.
- **Localization**
  - Added English translations for the new code block HTML preview feature and its description in workspace settings.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/i18n/src/i18n.gen.ts

@@ -5882,6 +5882,14 @@ export function useAFFiNEI18N(): {
       * `Once enabled, switch table view to virtual scroll mode in Database Block.`
       */
     ["com.affine.settings.workspace.experimental-features.enable-table-virtual-scroll.description"](): string;
+    /**
+      * `Code block HTML preview`
+      */
+    ["com.affine.settings.workspace.experimental-features.enable-code-block-html-preview.name"](): string;
+    /**
+      * `Once enabled, you can preview HTML in code block.`
+      */
+    ["com.affine.settings.workspace.experimental-features.enable-code-block-html-preview.description"](): string;
     /**
       * `Only an owner can edit the workspace avatar and name. Changes will be shown for everyone.`
       */

packages/frontend/i18n/src/resources/en.json

@@ -1469,6 +1469,8 @@
   "com.affine.settings.workspace.experimental-features.enable-edgeless-scribbled-style.description": "Once enabled, you can use scribbled style in edgeless mode.",
   "com.affine.settings.workspace.experimental-features.enable-table-virtual-scroll.name": "Database block table view virtual scroll",
   "com.affine.settings.workspace.experimental-features.enable-table-virtual-scroll.description": "Once enabled, switch table view to virtual scroll mode in Database Block.",
+  "com.affine.settings.workspace.experimental-features.enable-code-block-html-preview.name": "Code block HTML preview",
+  "com.affine.settings.workspace.experimental-features.enable-code-block-html-preview.description": "Once enabled, you can preview HTML in code block.",
   "com.affine.settings.workspace.not-owner": "Only an owner can edit the workspace avatar and name. Changes will be shown for everyone.",
   "com.affine.settings.workspace.preferences": "Preference",
   "com.affine.settings.workspace.billing": "Team's Billing",