g2 5.0 如何应用离屏 Canvas 提高大数据渲染性能

### 问题描述

g2 5.0 可以使用离屏 Canvas 吗，如果可以请提供个 demo

### 重现链接

_No response_

### 重现步骤

_No response_

### 预期行为

_No response_

### 平台

- 操作系统: [macOS, Windows, Linux, React Native ...]
- 网页浏览器: [Google Chrome, Safari, Firefox]

### 屏幕截图或视频（可选）

_No response_

### 补充说明（可选）

_No response_

No file, test, or entry point is identified in the issue. Start by locating the G2 5.0 rendering path and checking whether its browser canvas usage can work with OffscreenCanvas; done means a documented answer and a working large-data rendering demo, if supported.

Written by the indexing model from the issue text.