input: Write a python function to find the word with the highest frequency in a given string using the Counter class from the collections module.
  assert word_with_highest_frequency("Lorem ipsum dolor sit amet, consectetur adipiscing elit.") == ("dolor", 1)
  assert word_with_highest_frequency("apple apple orange banana apple") == ("apple", 3)
  assert word_with_highest_frequency("test test test testing test test") == ("test", 5)
output: from collections import Counter
  
  def word_with_highest_frequency(s):
      words = s.split()
      counter = Counter(words)
      most_common_word, frequency = counter.most_common(1)[0]
      return most_common_word, frequency