[Feature-Request] Blank-lines surrounding curly braces

Sorry if this is a dup, I searched for a little bit and only found issues related to blank lines inside curly braces.

I have no idea how hard this would be, but it would be really nice to have a configurable option to add blank lines surrounding anything with curly braces.

with the rule on

fn main() {
  let some_optional_value = map.get(&key); 
  
  if let Some(value) = some_optional_value {
      do_something_with_value(value);
  }
}

with the rule off

fn main() {
  let some_optional_value = map.get(&key);  
  if let Some(value) = some_optional_value {
      do_something_with_value(value);
  }
}

This would include for-loop, loop, while, etc. Any expressions with a scope defined by curly braces.

I'm thinking something akin to this rule: https://eslint.org/docs/latest/rules/padding-line-between-statements

I'm trying to have some automatic way to not get code that looks like this:

        let mut items = HashMap::new();
        for _ in 0..100 {
            let val: Vec<u8> = (0..10).map(|_| rng.borrow_mut().gen()).collect();
            items.insert(generate_key(), val);
        }
        let mut items_ordered: Vec<_> = items.clone();
        items_ordered.sort();
        items_ordered.shuffle(&mut *rng.borrow_mut());
        for (k, v) in items.into_iter() {
            other_map.insert(&k, v)?;
        }

and have the formatted add some empty lines to make the code easier to read

        let mut items = HashMap::new();

        for _ in 0..100 {
            let val: Vec<u8> = (0..10).map(|_| rng.borrow_mut().gen()).collect();
            items.insert(generate_key(), val);
        }

        let mut items_ordered: Vec<_> = items.clone();
        items_ordered.sort();
        items_ordered.shuffle(&mut *rng.borrow_mut());

        for (k, v) in items.into_iter() {
            other_map.insert(&k, v)?;
        }

Obviously, not everyone wants this, but it would be great if it were an option. I'm happy to PR, if someone can point me in the right direction.

No files, tests, or entry points are named. Start by reviewing the requested Rust examples and determining where formatting options and curly-brace scopes are handled. Done means a configurable rule adds surrounding blank lines for the described scoped constructs while leaving formatting unchanged when disabled, with coverage for the examples.