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
```
expect(data.fieldName).toEqual("foo.bar"
      }
    
  }
  describe("TextWidgetAnnotation", function () {
    let textWidgetDict, helvRefObj, gothRefObj;
    beforeEach(function () {
      textWidgetDict = new Dict(
      textWidgetDict.set("Type", Name.get("Annot")
      textWidgetDict.set("Subtype", Name.get("Widget")
      textWidgetDict.set("FT", Name.get("Tx")
      const helvDict = new Dict(
      helvDict.set("BaseFont", Name.get("Helvetica")
      helvDict.set("Type", Name.get("Font")
      helvDict.set("Subtype", Name.get("Type1")
      const gothDict = new Dict(
      gothDict.set("BaseFont", Name.get("MSGothic")
      gothDict.set("Type", Name.get("Font")
      gothDict.set("Subtype", Name.get("Type0")
      gothDict.set("Encoding", Name.get("UniJIS-UTF16-H")
      gothDict.set("Name", Name.get("MSGothic")
      const cidSysInfoDict = new Dict(
      cidSysInfoDict.set("Ordering", "Japan1"
      cidSysInfoDict.set("Registry", "Adobe"
      cidSysInfoDict.set("Supplement", "5"
      const fontDescriptorDict = new Dict(
      fontDescriptorDict.set("FontName", Name.get("MSGothic")
      fontDescriptorDict.set("CapHeight", "680"
      const gothDescendantDict = new Dict(
      gothDescendantDict.set("BaseFont", Name.get("MSGothic")