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
```
* with the new password, and a reason (see {@link PasswordResponses}).
       * @type {function}
       */
      this.onPassword = null;
      /**
       * Callback to be able to monitor the loading progress of the PDF file
       * (necessary to implement e.g. a loading bar).
       * The callback receives an {@link OnProgressParameters} argument.
       * @type {function}
       */
      this.onProgress = null;
      /**
       * Callback for when an unsupported feature is used in the PDF document.
       * The callback receives an {@link UNSUPPORTED_FEATURES} argument.
       * @type {function}
       */
      this.onUnsupportedFeature = null;
    }
    /**
     * Promise for document loading task completion.
     * @type {Promise<PDFDocumentProxy>}
     */
    get promise() {
      return this._capability.promise;
    }
    /**
     * @returns {Promise<void>} A promise that is resolved when destruction is
     *   completed.
     */
    destroy() {