feat(editor): mindmap gfx extension (#11936)

Closes: BS-3209

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

## Summary by CodeRabbit

- **New Features**
  - Introduced mind map view and store extensions, enhancing mind map integration and conversion to plain text and markdown formats.
  - Added priority property to quick tools, allowing for custom ordering in the toolbar.
- **Improvements**
  - Toolbar quick tools are now sorted by priority for a more intuitive user experience.
  - Updated toolbar and extension configurations to streamline available tools and extensions.
- **Bug Fixes**
  - Conditional registration of certain components ensures correct behavior in edgeless mode.
- **Chores**
  - Updated dependencies and project references to improve module integration and maintainability.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/gfx/mindmap/src/toolbar/config.ts

@@ -23,7 +23,7 @@ import {
   MindmapStyleOne,
   MindmapStyleThree,
   MindmapStyleTwo,
-} from '../view';
+} from '../view/index';
 
 const MINDMAP_STYLE_LIST = [
   {