Add and apply rules for multi-line arrays

We were already applying these rules in most cases.

Note we aren't enabling the `MultilineArrayLineBreaks` rule because
we've got places with many elements whire it isn't clear whether
having one element per line would make the code more readable.

app/models/concerns/statisticable.rb

@@ -163,8 +163,7 @@ module Statisticable
        [75, 79],
        [80, 84],
        [85, 89],
-       [90, 300]
-      ]
+       [90, 300]]
     end
 
     def participants_between_ages(from, to)