feat: improve grouping perf in edgeless (#14442)

fix #14433 

#### PR Dependency Tree


* **PR #14442** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

* **New Features**
  * Level-of-detail thumbnails for large images.
  * Adaptive pacing for snapping, distribution and other alignment work.
  * RAF coalescer utility to batch high-frequency updates.
  * Operation timing utility to measure synchronous work.

* **Improvements**
* Batch group/ungroup reparenting that preserves element order and
selection.
  * Coalesced panning and drag updates to reduce jitter.
* Connector/group indexing for more reliable updates, deletions and
sync.
  * Throttled viewport refresh behavior.

* **Documentation**
  * Docs added for RAF coalescer and measureOperation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/framework/std/src/gfx/index.ts

@@ -5,6 +5,8 @@ export {
   SortOrder,
 } from '../utils/layer.js';
 export {
+  batchAddChildren,
+  batchRemoveChildren,
   canSafeAddToContainer,
   descendantElementsImpl,
   getTopElements,
@@ -94,6 +96,8 @@ export {
   type SurfaceBlockProps,
   type SurfaceMiddleware,
 } from './model/surface/surface-model.js';
+export { measureOperation } from './perf.js';
+export { createRafCoalescer, type RafCoalescer } from './raf-coalescer.js';
 export { GfxSelectionManager } from './selection.js';
 export {
   SurfaceMiddlewareBuilder,