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
```
replyDict.set("IRT", annotationRef
      replyDict.set("RT", Name.get("Group")
      replyDict.set("T", "ReplyTitle"
      replyDict.set("Contents", "ReplyText"
      replyDict.set("CreationDate", "D:20180523"
      replyDict.set("M", "D:20190523"
      replyDict.set("C", [0.4]
      const xref = new XRefMock([
        { ref: annotationRef, data: annotationDict },
        { ref: popupRef, data: popupDict },
        { ref: replyRef, data: replyDict },
      ]
      annotationDict.assignXref(xref
      popupDict.assignXref(xref
      replyDict.assignXref(xref
      const { data } = await AnnotationFactory.create(
        xref,
        replyRef,
        pdfManagerMock,
        idFactoryMock
      
      expect(data.inReplyTo).toEqual(annotationRef.toString()
      expect(data.replyType).toEqual("Group"
      expect(data.title).toEqual("ParentTitle"
      expect(data.contents).toEqual("ParentText"
      expect(data.creationDate).toEqual("D:20180423"
      expect(data.modificationDate).toEqual("D:20190423"
      expect(data.color).toEqual(new Uint8ClampedArray([0, 0, 255])
      expect(data.hasPopup).toEqual(true
    }