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 (key !== "Off") {
        this.data.buttonValue = this._decodeFormValue(key);
        break;
      }
    }
    this.checkedAppearance = normalAppearance.get(this.data.buttonValue);
    this.uncheckedAppearance = normalAppearance.get("Off") || null;
    this._streams.push(this.checkedAppearance);
    if (this.uncheckedAppearance) {
      this._streams.push(this.uncheckedAppearance);
    }
    this._fallbackFontDict = this.fallbackFontDict;
  }
  _processPushButton(params) {
    if (
      !params.dict.has("A") &&
      !params.dict.has("AA") &&
      !this.data.alternativeText
    ) {
      warn("Push buttons without action dictionaries are not supported");
      return;
    }
    this.data.isTooltipOnly = !params.dict.has("A") && !params.dict.has("AA");
    Catalog.parseDestDictionary({
      destDict: params.dict,
      resultObj: this.data,
      docBaseUrl: params.pdfManager.docBaseUrl,
    });
  }
  getFieldObject() {