fix(g-canvas): clip animation should be effective

[dengfuping]

🤔 This is a ...

• New feature
• Bug fix
• TypeScript definition update
• Refactoring
• Performance improvement
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

• Close [4.0] 支持 shape 的 clip 动画 #218.

💡 Background and solution

• hasChanged should be updated after clip is drawn:

_applyClip(context, clip: ShapeBase) {
  if (clip) {
    clip.createPath(context);
    context.clip();
+   clip._afterDraw(); // clip 绘制完成后，需要缓存包围盒以及清除标记
  }
}

📝 Changelog

Language	Changelog
🇺🇸 English	🐞 [g-canvas] Fix that clip animation is not effective. #218
🇨🇳 Chinese	🐞 [g-canvas] 修复裁剪动画不生效的问题。#218

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[tests-checker]

Could you please add tests to make sure this change works as expected?

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