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
```
setVerbosityLevel(params.verbosity);
  if (!worker) {
    const workerParams = {
      verbosity: params.verbosity,
      port: GlobalWorkerOptions.workerPort,
    };
    
    
    worker = workerParams.port
      ? PDFWorker.fromPort(workerParams)
      : new PDFWorker(workerParams);
    task._worker = worker;
  }
  const docId = task.docId;
  worker.promise
    .then(function () {
      if (task.destroyed) {
        throw new Error("Loading aborted");
      }
      const workerIdPromise = _fetchDocument(
        worker,
        params,
        rangeTransport,
        docId
      );
      const networkStreamPromise = new Promise(function (resolve) {
        let networkStream;
        if (rangeTransport) {
          networkStream = new PDFDataTransportStream(