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/docs/api/@blocksuite/std/gfx/README.md

@@ -34,6 +34,7 @@
 - [canSafeAddToContainer](functions/canSafeAddToContainer.md)
 - [compareLayer](functions/compareLayer.md)
 - [convert](functions/convert.md)
+- [createRafCoalescer](functions/createRafCoalescer.md)
 - [derive](functions/derive.md)
 - [generateKeyBetween](functions/generateKeyBetween.md)
 - [generateKeyBetweenV2](functions/generateKeyBetweenV2.md)
@@ -42,5 +43,6 @@
 - [GfxCompatible](functions/GfxCompatible.md)
 - [isGfxGroupCompatibleModel](functions/isGfxGroupCompatibleModel.md)
 - [local](functions/local.md)
+- [measureOperation](functions/measureOperation.md)
 - [observe](functions/observe.md)
 - [watch](functions/watch.md)