refactor(editor): cleanup dead code (#12281)

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

- **Refactor**
  - Streamlined and consolidated block and inline extension exports by removing multiple block-spec and inline extension arrays from public APIs.
  - Reduced exported constants, types, and utility functions related to various block and embed features.
  - Simplified the codebase by removing deprecated type guards, adapter extensions, and redundant extension groupings.
- **Chores**
  - Cleaned up internal APIs by deleting unused exports, imports, and outdated code, enhancing maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/list/src/index.ts

@@ -2,6 +2,5 @@ export * from './adapters/index.js';
 export * from './commands';
 export { correctNumberedListsOrderToPrev } from './commands/utils';
 export * from './list-block.js';
-export * from './list-spec.js';
 export * from './turbo/list-layout-handler';
 export * from './turbo/list-painter.worker';

blocksuite/affine/blocks/list/src/list-spec.ts

@@ -1,14 +0,0 @@
-import { BlockViewExtension, FlavourExtension } from '@blocksuite/std';
-import type { ExtensionType } from '@blocksuite/store';
-import { literal } from 'lit/static-html.js';
-
-import { ListBlockAdapterExtensions } from './adapters/extension.js';
-import { ListKeymapExtension, ListTextKeymapExtension } from './list-keymap.js';
-
-export const ListBlockSpec: ExtensionType[] = [
-  FlavourExtension('affine:list'),
-  BlockViewExtension('affine:list', literal`affine-list`),
-  ListKeymapExtension,
-  ListTextKeymapExtension,
-  ListBlockAdapterExtensions,
-].flat();