Closes: BS-3393
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a new "Embed Doc" block, enabling embedding and rendering of linked and synced documents within cards, including support for banners and note previews.
- Added new toolbar and quick search options for inserting embedded linked and synced documents.
- **Improvements**
- Updated dependencies and internal references to support the new embed doc functionality across related blocks and components.
- Enhanced support for edgeless environments with new clipboard and configuration options for embedded docs.
- **Refactor**
- Streamlined and reorganized embed-related code, moving linked and synced doc logic into a dedicated embed doc module.
- Removed obsolete adapter and utility files to simplify maintenance.
- **Chores**
- Updated project and TypeScript configuration files to include the new embed doc module in builds and references.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
### TL;DR
Refactored extension registration to follow a more modular approach by moving extensions to their respective block packages.
### What changed?
- Removed centralized registration of several extensions from `store.ts` in the main package
- Moved the following extensions to their respective block packages:
- `CodeMarkdownPreprocessorExtension` to the code block package
- `LatexMarkdownPreprocessorExtension` to the latex block package
- `EmbedIframeConfigExtensions` and `EmbedIframeService` to the embed block package
- `ImageStoreSpec` removed from central registration
- Cleaned up unused arrays and imports in the main store file
- Removed empty `defaultBlockPlainTextAdapterMatchers` array
### How to test?
1. Verify that markdown preprocessing for code and latex blocks still works correctly
2. Check that iframe embeds function properly
3. Ensure image handling continues to work as expected
4. Test import/export functionality for all affected block types
### Why make this change?
This change improves code organization by following a more modular architecture where each block package is responsible for registering its own extensions. This approach reduces coupling between packages, makes the codebase more maintainable, and follows the principle that extensions should be registered where they are defined.
Saul-Mirone