refactor(editor): remove global types in config (#10143)

Closes: [BS-2554](https://linear.app/affine-design/issue/BS-2554/remove-global-types-in-block-config)

blocksuite/affine/block-code/src/code-block-config.ts

@@ -1,3 +1,4 @@
+import { ConfigExtensionFactory } from '@blocksuite/block-std';
 import type { BundledLanguageInfo, ThemeInput } from 'shiki';
 
 export interface CodeBlockConfig {
@@ -13,3 +14,6 @@ export interface CodeBlockConfig {
    */
   showLineNumbers?: boolean;
 }
+
+export const CodeBlockConfigExtension =
+  ConfigExtensionFactory<CodeBlockConfig>('affine:code');