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
```
docBaseUrl: source.docBaseUrl,
      ignoreErrors: source.ignoreErrors,
      isEvalSupported: source.isEvalSupported,
      fontExtraProperties: source.fontExtraProperties,
      enableXfa: source.enableXfa,
      useSystemFonts: source.useSystemFonts,
      cMapUrl: source.useWorkerFetch ? source.cMapUrl : null,
      standardFontDataUrl: source.useWorkerFetch
        ? source.standardFontDataUrl
        : null,
    })
    .then(function (workerId) {
      if (worker.destroyed) {
        throw new Error("Worker was destroyed");
      }
      return workerId;
    });
}
/**
 * @typedef {Object} OnProgressParameters
 * @property {number} loaded - Currently loaded number of bytes.
 * @property {number} total - Total number of bytes in the PDF file.
 */
/**
 * The loading task controls the operations required to load a PDF document
 * (such as network requests) and provides a way to listen for completion,
 * after which individual pages can be rendered.
 *
 * @typedef {Object} PDFDocumentLoadingTask
 * @property {string} docId - Unique identifier for the document loading task.