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
```
const intentState = this._intentStates.get(intent);
    if (!intentState) {
      return; 
    }
    if (this._stats) {
      this._stats.timeEnd("Page Request");
    }
    
    
    if (intentState.displayReadyCapability) {
      intentState.displayReadyCapability.resolve(transparency);
    }
  }
  /**
   * @private
   */
  _renderPageChunk(operatorListChunk, intentState) {