perf(editor): fallback to placeholder for canvas text (#12033)

### TL;DR

For canvas elements, this PR adds placeholders during zooming operations to improve performance.

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/lEGcysB4lFTEbCwZ8jMv/8c8daea8-1eb4-419b-a4f4-2a8847f40b7b.png)

### What changed?

- Implemented placeholder rendering during zooming operations in the canvas renderer, but not only DOM.
- Added a `forceFullRender` property to the `GfxCompatibleInterface` to allow elements to opt out of placeholder rendering
- Set `forceFullRender = true` for connectors to ensure they always render properly, even during zooming
- Connected the turbo renderer to the viewport's zooming state to automatically switch between full and placeholder rendering

### Why make this change?

Rendering complex elements during zooming operations can cause performance issues and make the UI feel sluggish. Rendering connector label also leads to high cost DOM `set font` delays.

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/lEGcysB4lFTEbCwZ8jMv/961fb847-24b4-4a7f-b9dc-21b0a5edaaa1.png)

The turbo renderer improves performance by displaying simple placeholders for elements during zooming, while still rendering critical elements like connectors fully. This creates a smoother user experience while maintaining essential visual information.

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

## Summary by CodeRabbit

- **New Features**
  - Introduced a feature-flag-controlled "turbo" rendering mode that displays placeholder graphics during zooming for improved performance.
  - Added the ability to override placeholder rendering for specific elements, ensuring full rendering when required.

- **Bug Fixes**
  - Enhanced rendering logic to ensure connectors always render fully, even during zoom operations.

- **Documentation**
  - Updated API documentation to reflect new properties related to rendering behavior.

- **Tests**
  - Improved tests to verify correct rendering behavior for connectors.

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

blocksuite/docs/api/@blocksuite/std/gfx/interfaces/GfxCompatibleInterface.md

@@ -26,6 +26,15 @@ The bound of the element without considering the response extension.
 
 ***
 
+### forceFullRender?
+
+> `optional` **forceFullRender**: `boolean`
+
+Whether to disable fallback rendering for this element, e.g., during zooming.
+Defaults to false (fallback to placeholder rendering is enabled).
+
+***
+
 ### lockedBySelf?
 
 > `optional` **lockedBySelf**: `boolean`

blocksuite/docs/api/@blocksuite/std/gfx/interfaces/GfxGroupCompatibleInterface.md

@@ -45,6 +45,19 @@ The bound of the element without considering the response extension.
 
 ***
 
+### forceFullRender?
+
+> `optional` **forceFullRender**: `boolean`
+
+Whether to disable fallback rendering for this element, e.g., during zooming.
+Defaults to false (fallback to placeholder rendering is enabled).
+
+#### Inherited from
+
+[`GfxCompatibleInterface`](GfxCompatibleInterface.md).[`forceFullRender`](GfxCompatibleInterface.md#forcefullrender)
+
+***
+
 ### lockedBySelf?
 
 > `optional` **lockedBySelf**: `boolean`