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
```
warn(
                "save - ignoring annotation data during " +
                  `"${task.name}" task: "${reason}".`
              );
              return null;
            })
        );
      }
      return Promise.all(newRefsPromises);
    });
  }
  loadResources(keys) {
    if (!this.resourcesPromise) {
      
      this.resourcesPromise = this.pdfManager.ensure(this, "resources");
    }
    return this.resourcesPromise.then(() => {
      const objectLoader = new ObjectLoader(this.resources, keys, this.xref);
      return objectLoader.load();
    });
  }
  getOperatorList({
    handler,
    sink,
    task,
    intent,
    renderInteractiveForms,
    annotationStorage,
  }) {
    const contentStreamPromise = this.getContentStream();