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 

constructor(parameters) {
    super(parameters);
    this.data.annotationType = AnnotationType.FREETEXT;
  }
}
class LineAnnotation extends MarkupAnnotation {
  constructor(parameters) {
    super(parameters);
    this.data.annotationType = AnnotationType.LINE;
    const lineCoordinates = parameters.dict.getArray("L");
    this.data.lineCoordinates = Util.normalizeRect(lineCoordinates);
    if (!this.appearance) {
      
      const strokeColor = this.color
        ? Array.from(this.color).map(c => c / 255)
        : [0, 0, 0];
      const borderWidth = this.borderStyle.width;
      
      
      if (isArrayEqual(this.rectangle, [0, 0, 0, 0])) {
        this.rectangle = [
          this.data.lineCoordinates[0] - 2 * borderWidth,
          this.data.lineCoordinates[1] - 2 * borderWidth,
          this.data.lineCoordinates[2] + 2 * borderWidth,
          this.data.lineCoordinates[3] + 2 * borderWidth,
        ];
      }
      this._setDefaultAppearance({
        xref: parameters.xref,