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._internalRenderTask.cancel();
  }
}
/**
 * For internal use only.
 * @ignore
 */
const InternalRenderTask = (function InternalRenderTaskClosure() {
  const canvasInRendering = new WeakSet();
  
  class InternalRenderTask {
    constructor({
      callback,
      params,
      objs,
      commonObjs,
      operatorList,
      pageIndex,
      canvasFactory,
      useRequestAnimationFrame = false,
      pdfBug = false,
    }) {
      this.callback = callback;