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
```
return (this._structTreePromise ||= this._transport.getStructTree(
      this._pageIndex
    ));
  }
  /**
   * Destroys the page object.
   * @private
   */
  _destroy() {
    this.destroyed = true;
    this._transport.pageCache[this._pageIndex] = null;
    const waitOn = [];
    for (const [intent, intentState] of this._intentStates) {
      this._abortOperatorList({
        intentState,
        reason: new Error("Page was destroyed."),
        force: true,
      });
      if (intent === "oplist") {