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
```
value.byteLength
          );
        } else {
          result = new value.constructor(value);
        }
        cloned.set(value, result);
        return result;
      }
      if (value instanceof Map) {
        result = new Map();
        cloned.set(value, result); 
        for (const [key, val] of value) {
          result.set(key, cloneValue(val));
        }
        return result;
      }
      if (value instanceof Set) {
        result = new Set();
        cloned.set(value, result); 
        for (const val of value) {
          result.add(cloneValue(val));
        }
        return result;
      }
      result = Array.isArray(value) ? [] : Object.create(null);
      cloned.set(value, result); 
      
      
      for (const i in value) {
        let desc,