fix(editor): add code block clipboard extension (#11731)

Close [BS-3109](https://linear.app/affine-design/issue/BS-3109/code-block-不支援-markdown-語法)

blocksuite/affine/blocks/root/src/clipboard/readonly-clipboard.ts

@@ -34,6 +34,12 @@ const NotionClipboardConfig = ClipboardAdapterConfigExtension({
   priority: 95,
 });
 
+const HtmlClipboardConfig = ClipboardAdapterConfigExtension({
+  mimeType: 'text/html',
+  adapter: HtmlAdapter,
+  priority: 90,
+});
+
 const imageClipboardConfigs = [
   'image/apng',
   'image/avif',
@@ -46,20 +52,14 @@ const imageClipboardConfigs = [
   return ClipboardAdapterConfigExtension({
     mimeType,
     adapter: ImageAdapter,
-    priority: 85,
+    priority: 80,
   });
 });
 
 const PlainTextClipboardConfig = ClipboardAdapterConfigExtension({
   mimeType: 'text/plain',
   adapter: MixTextAdapter,
-  priority: 80,
-});
-
-const HtmlClipboardConfig = ClipboardAdapterConfigExtension({
-  mimeType: 'text/html',
-  adapter: HtmlAdapter,
-  priority: 75,
+  priority: 70,
 });
 
 const AttachmentClipboardConfig = ClipboardAdapterConfigExtension({