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
```
}
        const matrix = [1, 0, 0, 1, 0, 0];
        const bbox = [
          0,
          0,
          this.data.rect[2] - this.data.rect[0],
          this.data.rect[3] - this.data.rect[1],
        ];
        const transform = getTransformMatrix(this.data.rect, bbox, matrix);
        operatorList.addOp(OPS.beginAnnotation, [
          this.data.rect,
          transform,
          matrix,
        ]);
        const stream = new StringStream(content);
        return evaluator
          .getOperatorList({
            stream,
            task,
            resources: this._fieldResources.mergedResources,
            operatorList,
          })
          .then(function () {
            operatorList.addOp(OPS.endAnnotation, []);
            return operatorList;
          });
      }
    );
  }
  async save(evaluator, task, annotationStorage) {