input: Write a function to group integers into evens and odds.
  assert group_integers([1, 2, 3, 4, 5, 6]) == ([2, 4, 6], [1, 3, 5])
  assert group_integers([10, 21, 32, 43, 54]) == ([10, 32, 54], [21, 43])
  assert group_integers([5, 7, 9, 8, 6, 4, 3]) == ([8, 6, 4], [5, 7, 9, 3])
output: def group_integers(lst):
      evens = [x for x in lst if x % 2 == 0]
      odds = [x for x in lst if x % 2 != 0]
      return (evens, odds)