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
```
if (this.xfaFactory) {
      return this.xfaFactory.serializeData(annotationStorage);
    }
    return null;
  }
  get formInfo() {
    const formInfo = {
      hasFields: false,
      hasAcroForm: false,
      hasXfa: false,
      hasSignatures: false,
    };
    const acroForm = this.catalog.acroForm;
    if (!acroForm) {
      return shadow(this, "formInfo", formInfo);
    }
    try {
      const fields = acroForm.get("Fields");