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
```
this.destroyed = true;
      const transportDestroyed = !this._transport
        ? Promise.resolve()
        : this._transport.destroy();
      return transportDestroyed.then(() => {
        this._transport = null;
        if (this._worker) {
          this._worker.destroy();
          this._worker = null;
        }
      });
    }
  }
  return PDFDocumentLoadingTask;
})();
/**
 * Abstract class to support range requests file loading.
 */
class PDFDataRangeTransport {
  /**
   * @param {number} length
   * @param {Uint8Array} initialData
   * @param {boolean} [progressiveDone]
   * @param {string} [contentDispositionFilename]
   */
  constructor(