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
```
if (
    typeof PDFJSDev === "undefined" ||
    PDFJSDev.test("!PRODUCTION || TESTING")
  ) {
    assert(limit > 0, 'The "limit" must be a positive integer.');
  }
  const signatureLength = signature.length;
  const scanBytes = stream.peekBytes(limit);
  const scanLength = scanBytes.length - signatureLength;
  if (scanLength <= 0) {
    return false;
  }
  if (backwards) {
    const signatureEnd = signatureLength - 1;
    let pos = scanBytes.length - 1;
    while (pos >= signatureEnd) {
      let j = 0;
      while (
        j < signatureLength &&
        scanBytes[pos - j] === signature[signatureEnd - j]
      ) {
        j++;