Write a method called interleave that accepts two integer arrays as parameters and returns a new array that contains the result of interleaving the two arrays. For example, if arrays list1 and list2 store {2, 4, 6} and {10, 20, 30, 40, 50} respectively, the call of interleave(list1, list2) should return a new array containing {2, 10, 4, 20, 6, 30, 40, 50}.