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 DocumentInfoValidators = {
      Title: isString,
      Author: isString,
      Subject: isString,
      Keywords: isString,
      Creator: isString,
      Producer: isString,
      CreationDate: isString,
      ModDate: isString,
      Trapped: isName,
    };
    let version = this._version;
    if (
      typeof version !== "string" ||
      !PDF_HEADER_VERSION_REGEXP.test(version)
    ) {
      warn(`Invalid PDF header version number: ${version}`);
      version = null;
    }
    const docInfo = {