Configuration:
- PDF.js version: 2.0.550

Steps to reproduce the problem:
1. Render document in SVG mode `renderMode="svg"`

What is the expected behavior? (add screenshot)
Rendering annotations same way as they rendered on canvas

What went wrong? (add screenshot)
```
Warning: Unimplemented operator beginAnnotations
Warning: Unimplemented operator endAnnotations
```
const customAppearance = params.dict.get("AP");
    if (!isDict(customAppearance)) {
      return;
    }
    const normalAppearance = customAppearance.get("N");
    if (!isDict(normalAppearance)) {
      return;
    }
    const exportValues = normalAppearance.getKeys();
    if (!exportValues.includes("Off")) {
      
      exportValues.push("Off");
    }
    if (exportValues.length !== 2) {
      return;
    }
    this.data.exportValue =
      exportValues[0] === "Off" ? exportValues[1] : exportValues[0];
    this.checkedAppearance = normalAppearance.get(this.data.exportValue);
    this.uncheckedAppearance = normalAppearance.get("Off") || null;
    this._streams.push(this.checkedAppearance);
    if (this.uncheckedAppearance) {
      this._streams.push(this.uncheckedAppearance);
    }
    this._fallbackFontDict = this.fallbackFontDict;
  }
  _processRadioButton(params) {