支持 polygonOffset

[xiaoiver]

目前 polygonOffset 为 boolean，开启后设置固定值：

gl.polygonOffset(1, 1);

需要支持 factor units 可配置：

void gl.polygonOffset(factor, units);

https://developer.mozilla.org/zh-CN/docs/Web/API/WebGLRenderingContext/polygonOffset
https://www.w3.org/TR/webgpu/#dom-gpudepthstencilstate-depthbias

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

---

Title: Support polygonOffset

Currently polygonOffset is boolean. Set a fixed value after it is turned on:

gl.polygonOffset(1, 1);

Need to support factor units configurable:

void gl.polygonOffset(factor, units);

https://developer.mozilla.org/zh-CN/docs/Web/API/WebGLRenderingContext/polygonOffset

[xiaoiver]

这样可以为 z-fighting 问题提供一种解决方案：
antvis/G#1688