fix: remove defXY and cx/cy should not affect transform #1624

[xiaoiver]

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• [x] Bug fix
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🔗 Related issue link

1624

💡 Background and solution

目前以下属性均会影响 transform，不光会增加初始化阶段的时间影响性能，也会让 transformOrigin 这样的属性变得晦涩。

• Circle / Ellipse 的 cx/cy
• Rect / Group / CustomElement 的 x/y
• Line 的 x1/y1/x2/y2
• Path 的 d

GUI / G2 中由该问题引发了不少问题：

• SVG 动画闪动
• component 中需要反复设置 transform，重新计算包围盒等

因此在 group & customElement 去除 x/y 属性，同时去除 anchor 属性。 值得一提的是在 SVG 规范中 也是没有 x/y 属性的：https://developer.mozilla.org/en-US/docs/Web/SVG/Element/g

📝 Changelog

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• [ ] Doc is updated/provided or not needed
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• [ ] TypeScript definition is updated/provided or not needed
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