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  - Cleaned up internal APIs by deleting unused exports, imports, and outdated code, enhancing maintainability.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/latex/src/index.ts

@@ -3,7 +3,6 @@ import type * as RemarkMathType from 'remark-math';
 export * from './adapters';
 export * from './commands';
 export * from './latex-block';
-export * from './latex-spec';
 
 // Global types
 declare type _GLOBAl = typeof RemarkMathType;

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

@@ -1,13 +0,0 @@
-import { SlashMenuConfigExtension } from '@blocksuite/affine-widget-slash-menu';
-import { BlockViewExtension } from '@blocksuite/std';
-import type { ExtensionType } from '@blocksuite/store';
-import { literal } from 'lit/static-html.js';
-
-import { LatexBlockAdapterExtensions } from './adapters/extension.js';
-import { latexSlashMenuConfig } from './configs/slash-menu.js';
-
-export const LatexBlockSpec: ExtensionType[] = [
-  BlockViewExtension('affine:latex', literal`affine-latex`),
-  LatexBlockAdapterExtensions,
-  SlashMenuConfigExtension('affine:latex', latexSlashMenuConfig),
-].flat();