Count the frequency of each element in a list and return a map where the keys are the elements and the values are their frequencies.
Examples:
Input: elements = ['a', 'b', 'a', 'c', 'b', 'a']
Output: {'a': 3, 'b': 2, 'c': 1}
Explanation: 'a' appears 3 times, 'b' appears 2 times, and 'c' appears once
Input: elements = [1, 2, 3, 4]
Output: {1: 1, 2: 1, 3: 1, 4: 1}
Explanation: Each element appears exactly once
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