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.pdfManager.enableXfa &&
      this.formInfo.hasXfa &&
      !this.formInfo.hasAcroForm
    ) {
      const data = this.xfaData;
      return shadow(this, "xfaFactory", data ? new XFAFactory(data) : null);
    }
    return shadow(this, "xfaFaxtory", null);
  }
  get isPureXfa() {