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 

const strokeColor = this.color
        ? Array.from(this.color).map(c => c / 255)
        : [0, 0, 0];
      const borderWidth = this.borderStyle.width || 1;
      this._setDefaultAppearance({
        xref: parameters.xref,
        extra: `${borderWidth} w`,
        strokeColor,
        pointsCallback: (buffer, points) => {
          const vertices = this.data.vertices;
          for (let i = 0, ii = vertices.length; i < ii; i++) {
            buffer.push(
              `${vertices[i].x} ${vertices[i].y} ${i === 0 ? "m" : "l"}`
            );
          }
          buffer.push("S");
          return [points[0].x, points[1].x, points[3].y, points[1].y];
        },
      });
    }
  }
}
class PolygonAnnotation extends PolylineAnnotation {
  constructor(parameters) {
    /
    super(parameters);
    this.data.annotationType = AnnotationType.POLYGON;
  }
}
class CaretAnnotation extends MarkupAnnotation {