Add a feature to add a space between parenthesis and arguments

[Ultra980]

Hello,
Usually, when I write code, I write my functions like this:

fn add( a: i64, b: i64 ) {
    return a + b;
}

I also do this for while:

while ( true ) {
    // ...
}

Is there a way to do this with rustfmt? If there isn't, could it be added?

[ytmimi]

Thanks for reaching out. Going to close this as a duplicate of #5435