File and Method Length Ignore Empty Lines

Sometimes it's nice to add new lines to create logical blocks inside a function. It would be great if there were an option to ignore empty lines when doing a line count. 

I propose:
```
{
    "type": "MethodLength",
    "props": {
        "severity": "ERROR",
        "max": 50,
        "ignoreEmptyLines": true 
    }
}
```