Attach (recommended) or Link to PDF file here: 
[A Sample PDF Clean 0 degree with all annotations-original-rotated.pdf](https://github.com/mozilla/pdf.js/files/6551789/A.Sample.PDF.Clean.0.degree.with.all.annotations-original-rotated.pdf)

Configuration:
- Web browser and its version: all browsers, tested with Chrome and Firefox latest versions.
- Operating system and its version: tested in Windows 10
- PDF.js version: current (online version)

Steps to reproduce the problem:
1. Visit https://mozilla.github.io/pdf.js/web/viewer.html
2. Upload the file above
3. Notice that several annotations such as arrow, freehand & polyline are missing (compared to Acrobat Reader)
![image](https://user-images.githubusercontent.com/45581023/119781014-11d35d00-befd-11eb-8daa-64f15374cf5b.png)


What is the expected behavior?
- Should display all annotations accordingly to Acrobat Reader

What went wrong? 
- Several annotations are missing such as arrow, freehand & polyline
- Opacity property is not supported and cannot be retrieved via getAnnotations 

warn(
              `Unimplemented annotation type "${subtype}", ` +
                "falling back to base annotation."
            );
          }
        }
        return new Annotation(parameters);
    }
  }
  static async _getPageIndex(xref, ref, pdfManager) {
    try {
      const annotDict = await xref.fetchIfRefAsync(ref);
      if (!isDict(annotDict)) {
        return -1;
      }
      const pageRef = annotDict.getRaw("P");
      if (!isRef(pageRef)) {
        return -1;
      }
      const pageIndex = await pdfManager.ensureCatalog("getPageIndex", [
        pageRef,
      ]);
      return pageIndex;
    } catch (ex) {
      warn(`_getPageIndex: "${ex}".`);
      return -1;
    }
  }
}
function getRgbColor(color) {