fix: break between non-block if/else statements

[jtkiesel]

What changed with this PR:

Non-block if/else statements are now kept on their own lines, like Prettier JavaScript does. This aligns Prettier Java with the Checkstyle config that it provides.

Example

Input

class Example {

  void example() {
    if (test); else {
      System.out.println("one");
    }

    if (test); else;

    if (this instanceof Circle) return "Circle: " + area(); else if (
      this instanceof Rectangle
    ) return "Rectangle: " + area(); else if (
      this instanceof RightTriangle
    ) return "Triangle: " + area();
  }
}

Output

class Example {

  void example() {
    if (test);
    else {
      System.out.println("one");
    }

    if (test);
    else;

    if (this instanceof Circle) return "Circle: " + area();
    else if (this instanceof Rectangle) return "Rectangle: " + area();
    else if (this instanceof RightTriangle) return "Triangle: " + area();
  }
}

Relative issues or prs:

Closes #631