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
```
this.xref.setStartXRef(this.startXRef);
  }
  get numPages() {
    if (this.xfaFactory) {
      return shadow(this, "numPages", this.xfaFactory.numberPages);
    }
    const linearization = this.linearization;
    const num = linearization ? linearization.numPages : this.catalog.numPages;
    return shadow(this, "numPages", num);
  }
  /**
   * @private
   */
  _hasOnlyDocumentSignatures(fields, recursionDepth = 0) {