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
```
AnnotationFieldFlag.FILESELECT;
      let promise = Promise.resolve(
      for (let i = 0, ii = invalidFieldFlags.length; i <= ii; i++) {
        promise = promise.then(() => {
          textWidgetDict.set("MaxLen", 20
          textWidgetDict.set("Ff", flags
          const textWidgetRef = Ref.get(93, 0
          const xref = new XRefMock([
            { ref: textWidgetRef, data: textWidgetDict },
          ]
          return AnnotationFactory.create(
            xref,
            textWidgetRef,
            pdfManagerMock,
            idFactoryMock
          ).then(({ data }) => {
            expect(data.annotationType).toEqual(AnnotationType.WIDGET
            const valid = invalidFieldFlags.length === 0;
            expect(data.comb).toEqual(valid
            
            if (!valid) {
              flags -= invalidFieldFlags.pop(
            }
          }
        }
      }
      await promise;
    }
    it("should render regular text for printing", async function () {
      const textWidgetRef = Ref.get(271, 0