input: Write a python function to validate that all values in a dictionary are strings.
  assert DataStorage({'a': 'apple', 'b': 'banana'})
  assert DataStorage({'x': 'xenon', 'y': 'yttrium', 'z': 'zinc'})
  assert DataStorage({'1': 'one', '2': 'two', '3': 'three'})
output: def DataStorage(data):
      return all(isinstance(value, str) for value in data.values())