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
```
return Promise.all([
      pdfManager.ensureCatalog("acroForm"),
      collectFields ? this._getPageIndex(xref, ref, pdfManager) : -1,
    ]).then(([acroForm, pageIndex]) =>
      pdfManager.ensure(this, "_create", [
        xref,
        ref,
        pdfManager,
        idFactory,
        acroForm,
        collectFields,
        pageIndex,
      ])
    );
  }
  /**
   * @private
   */
  static _create(