`factor()` does not factorize polynomial and returns expanded form

### Steps to Reproduce

```js
console.log(factor('x^2 + 5x + 6').latex);
```

### Actual Result

```
x^2+5x+6
```

### Expected Result

https://mathlive.io/compute-engine/guides/simplify/#explicit-factoring-and-expansion

```
(x+2)(x+3)
```

### Environment

Compute Engine version: 0.58.0