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.optimizer.flush();
    const length = this.length;
    this._totalLength += length;
    this._streamSink.enqueue(
      {
        fnArray: this.fnArray,
        argsArray: this.argsArray,
        lastChunk,
        length,
      },
      1,
      this._transfers
    );
    this.dependencies.clear();
    this.fnArray.length = 0;
    this.argsArray.length = 0;
    this.weight = 0;
    this.optimizer.reset();
  }
}
export { OperatorList };