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 hasFields = Array.isArray(fields) && fields.length > 0;
      formInfo.hasFields = hasFields; 
      
      
      const xfa = acroForm.get("XFA");
      formInfo.hasXfa =
        (Array.isArray(xfa) && xfa.length > 0) ||
        (isStream(xfa) && !xfa.isEmpty);
      
      
      
      
      
      
      
      const sigFlags = acroForm.get("SigFlags");
      const hasSignatures = !!(sigFlags & 0x1);
      const hasOnlyDocumentSignatures =
        hasSignatures && this._hasOnlyDocumentSignatures(fields);
      formInfo.hasAcroForm = hasFields && !hasOnlyDocumentSignatures;
      formInfo.hasSignatures = hasSignatures;
    } catch (ex) {
      if (ex instanceof MissingDataException) {
        throw ex;
      }
      warn(`Cannot fetch form information: "${ex}".`);
    }
    return shadow(this, "formInfo", formInfo);
  }
  get documentInfo() {