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
```
gothDescendantDict.set("CIDSystemInfo", cidSysInfoDict
      gothDescendantDict.set("Subtype", Name.get("CIDFontType2")
      gothDescendantDict.set("Type", Name.get("Font")
      gothDescendantDict.set("FontDescriptor", fontDescriptorDict
      gothDict.set("DescendantFonts", [gothDescendantDict]
      const helvRef = Ref.get(314, 0
      const gothRef = Ref.get(159, 0
      helvRefObj = { ref: helvRef, data: helvDict };
      gothRefObj = { ref: gothRef, data: gothDict };
      const resourceDict = new Dict(
      const fontDict = new Dict(
      fontDict.set("Helv", helvRef
      resourceDict.set("Font", fontDict
      textWidgetDict.set("DA", "/Helv 5 Tf"
      textWidgetDict.set("DR", resourceDict
      textWidgetDict.set("Rect", [0, 0, 32, 10]
    }
    afterEach(function () {
      textWidgetDict = helvRefObj = gothRefObj = null;
    }
    it("should handle unknown text alignment, maximum length and flags", async function () {
      textWidgetDict.set("DV", "foo"
      const textWidgetRef = Ref.get(124, 0
      const xref = new XRefMock([{ ref: textWidgetRef, data: textWidgetDict }]
      const { data } = await AnnotationFactory.create(
        xref,
        textWidgetRef,
        pdfManagerMock,
        idFactoryMock