Rule: Mandatory braces for single-line for loop bodies

I'd like to have the option to enforce braces around for loops with a single statement for the body. This is similar to #365, which added this for `if` statements.

Non-compliant example:
```kotlin
for (i in 0..10)
    println(i)
```

Compliant example:
```kotlin
for (i in 0..10) {
    println(i)
}
````

Compliant example 2:
```kotlin
for (i in 0..10) println(i)
```