input: Write a function to find the maximum value in a list using a lambda function.
  assert max_value([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 10
  assert max_value([10, 20, 45, 67, 84, 93]) == 93
  assert max_value([5, 7, 9, 8, 6, 4, 3]) == 9
output: def max_value(lst):
      return reduce(lambda x, y: x if x > y else y, lst)
  
  from functools import reduce