fix(editor): handle html content copied from google docs (#12383)

Closes: [BS-3508](https://linear.app/affine-design/issue/BS-3508/google-docs复制内容到affine时自动加粗问题)

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

- **New Features**
  - Improved detection of bold, italic, underline, and strike-through formatting in imported HTML, supporting both tags and inline CSS styles.
  - Enhanced handling of inline elements containing block-level children to ensure correct formatting and structure during HTML import.
  - Introduced a plugin that converts inline elements with block-level children into block elements, preserving original tag information.
- **Bug Fixes**
  - Resolved issues where block-level elements nested inside inline tags could cause incorrect formatting or structure.
- **Tests**
  - Added comprehensive test coverage for HTML formatting conversions and plugin behavior to ensure accuracy and reliability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/shared/src/adapters/html/rehype-plugins/index.ts

@@ -0,0 +1 @@
+export * from './inline-to-block';