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 storageEntry =
      annotationStorage && annotationStorage.get(this.data.id);
    if (storageEntry && storageEntry.print !== undefined) {
      return storageEntry.print;
    }
    return this.printable;
  }
  /**
   * @type {boolean}
   */
  get viewable() {
    if (this.data.quadPoints === null) {
      return false;
    }
    if (this.flags === 0) {
      return true;
    }
    return this._isViewable(this.flags);
  }
  /**
   * @type {boolean}
   */
  get printable() {