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
```
const task = new PDFDocumentLoadingTask();
  let source;
  if (typeof src === "string" || src instanceof URL) {
    source = { url: src };
  } else if (isArrayBuffer(src)) {
    source = { data: src };
  } else if (src instanceof PDFDataRangeTransport) {
    source = { range: src };
  } else {
    if (typeof src !== "object") {
      throw new Error(
        "Invalid parameter in getDocument, " +
          "need either string, URL, Uint8Array, or parameter object."
      );
    }