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 annots = this._getInheritableProperty("Annots");
    return shadow(this, "annotations", Array.isArray(annots) ? annots : []);
  }
  get _parsedAnnotations() {
    const parsedAnnotations = this.pdfManager
      .ensure(this, "annotations")
      .then(() => {
        const annotationPromises = [];
        for (const annotationRef of this.annotations) {
          annotationPromises.push(
            AnnotationFactory.create(
              this.xref,
              annotationRef,
              this.pdfManager,
              this._localIdFactory,
               false
            ).catch(function (reason) {
              warn(`_parsedAnnotations: "${reason}".`);
              return null;
            })
          );
        }
        return Promise.all(annotationPromises).then(function (annotations) {
          return annotations.filter(annotation => !!annotation);
        });
      });
    return shadow(this, "_parsedAnnotations", parsedAnnotations);
  }
  get jsActions() {