input: Write a python function to find the maximum value and its index in a list.
  assert find_max_and_index([3, 2, 5, 8, 6]) == (8, 3)
  assert find_max_and_index([1, 4, 7, 2, 5]) == (7, 2)
  assert find_max_and_index([10, 20, 30, 40, 50]) == (50, 4)
output: def find_max_and_index(lst):
      max_value = max(lst)
      max_index = lst.index(max_value)
      return max_value, max_index