input: Write a python function to find the most frequent element in a list and return it along with its count.
  assert find_most_frequent([1, 2, 2, 3, 3, 3, 4]) == (3, 3)
  assert find_most_frequent(['a', 'b', 'b', 'b', 'c', 'a', 'a']) == ('b', 3)
  assert find_most_frequent([5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3]) == (3, 5)
output: def find_most_frequent(lst):
      from collections import Counter
      counter = Counter(lst)
      most_common = counter.most_common(1)[0]
      return most_common