Given a list of integers, partition them into two groups: even numbers and odd numbers. Return a Map with exactly two keys: 'even' containing the even numbers and 'odd' containing the odd numbers, each preserving the original order.
Return a map with empty lists for both keys if the input is null or empty.
Examples:
Input: numbers = [1, 2, 3, 4, 5]
Output: {even=[2, 4], odd=[1, 3, 5]}
Explanation: Evens are 2 and 4; odds are 1, 3, and 5
Input: numbers = [2, 4, 6]
Output: {even=[2, 4, 6], odd=[]}
Explanation: All even numbers
Input: numbers = [1, 3, 5]
Output: {even=[], odd=[1, 3, 5]}
Explanation: All odd numbers
Input: numbers = []
Output: {even=[], odd=[]}
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