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 (alignment === 0 || alignment > 2) {
      
      return (
        "/Tx BMC q BT " +
        defaultAppearance +
        ` 1 0 0 1 ${hPadding} ${vPadding} Tm (${escapeString(
          encodedString
        )}) Tj` +
        " ET Q EMC"
      );
    }
    const renderedText = this._renderText(
      encodedString,
      font,
      fontSize,
      totalWidth,
      alignment,
      hPadding,
      vPadding
    );
    return (
      "/Tx BMC q BT " +
      defaultAppearance +
      ` 1 0 0 1 0 0 Tm ${renderedText}` +
      " ET Q EMC"
    );
  }
  async _getFontData(evaluator, task) {