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
```
constructor(parameters) {
    super(parameters);
    this.data.annotationType = AnnotationType.CIRCLE;
    if (!this.appearance) {
      
      const strokeColor = this.color
        ? Array.from(this.color).map(c => c / 255)
        : [0, 0, 0];
      const strokeAlpha = parameters.dict.get("CA");
      
      let fillColor = null;
      let interiorColor = parameters.dict.getArray("IC");
      if (interiorColor) {
        interiorColor = getRgbColor(interiorColor);
        fillColor = interiorColor
          ? Array.from(interiorColor).map(c => c / 255)
          : null;
      }
      const fillAlpha = fillColor ? strokeAlpha : null;
      
      /
      /
      const controlPointsDistance = (4 / 3) * Math.tan(Math.PI / (2 * 4));
      this._setDefaultAppearance({
        xref: parameters.xref,
        extra: `${this.borderStyle.width} w`,
        strokeColor,
        fillColor,
        strokeAlpha,