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
```
dict.set("V", isAscii(value) ? value : stringToUTF16BEString(value));
    dict.set("AP", AP);
    dict.set("M", `D:${getModificationDate()}`);
    const appearanceDict = new Dict(xref);
    appearanceDict.set("Length", appearance.length);
    appearanceDict.set("Subtype", Name.get("Form"));
    appearanceDict.set("Resources", this._getSaveFieldResources(xref));
    appearanceDict.set("BBox", bbox);
    const bufferOriginal = [`${this.ref.num} ${this.ref.gen} obj\n`];
    writeDict(dict, bufferOriginal, originalTransform);
    bufferOriginal.push("\nendobj\n");
    const bufferNew = [`${newRef.num} ${newRef.gen} obj\n`];
    writeDict(appearanceDict, bufferNew, newTransform);
    bufferNew.push(" stream\n", appearance, "\nendstream\nendobj\n");
    return [
      
      
      { ref: this.ref, data: bufferOriginal.join(""), xfa },
      
      { ref: newRef, data: bufferNew.join(""), xfa: null },
    ];
  }
  async _getAppearance(evaluator, task, annotationStorage) {
    const isPassword = this.hasFieldFlag(AnnotationFieldFlag.PASSWORD);
    if (!annotationStorage || isPassword) {
      return null;
    }
    const storageEntry = annotationStorage.get(this.data.id);
    let value = storageEntry && storageEntry.value;
    if (value === undefined) {