Closes: [BS-2539](https://linear.app/affine-design/issue/BS-2539/为-affine-添加-ef，并且支持在-affine-预览对应的功能)
> [!warning]
> This feature is only available in the canary build and is intended for debugging purposes.
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced an "Adapter Panel" feature with a new sidebar tab for previewing document content in multiple formats (Markdown, PlainText, HTML, Snapshot), controllable via a feature flag.
- Added a fully integrated adapter panel component with reactive UI elements for selecting adapters, toggling HTML preview modes, and updating content.
- Provided a customizable adapter panel for both main app and playground environments, supporting content transformation pipelines and export previews.
- Enabled seamless toggling and live updating of adapter panel content through intuitive menus and controls.
- **Localization**
- Added English translations and descriptive settings for the Adapter Panel feature.
- **Chores**
- Added new package and workspace dependencies along with TypeScript project references to support the Adapter Panel modules and components.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
