input: Write a python function to initialize a list with given elements using the ListInitializer class.
  assert initialize_list([1, 2, 3, 4]).list == [1, 2, 3, 4]
  assert initialize_list(['a', 'b', 'c']).list == ['a', 'b', 'c']
  assert initialize_list([]).list == []
output: class ListInitializer:
      def __init__(self, elements):
          self.list = elements
  
  def initialize_list(elements):
      return ListInitializer(elements)