ROC is missing `Momentum` return value

### The problem

in indicator roc.py has missing momentum, you should add the following lines in it

Error message(s):

```bash
    @property
    def momentum(self) -> Optional[float]:
        return self._csdata.Momentum

    @momentum.setter
    def roc_sma(self, value):
        self._csdata.Momentum = value
```
