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
```
let rotate = this._getInheritableProperty("Rotate") || 0;
    
    if (rotate % 90 !== 0) {
      rotate = 0;
    } else if (rotate >= 360) {
      rotate %= 360;
    } else if (rotate < 0) {
      
      
      rotate = ((rotate % 360) + 360) % 360;
    }
    return shadow(this, "rotate", rotate);
  }
  /**
   * @returns {Promise<BaseStream>}
   */
  getContentStream() {