Move all zeroes in a list of integers to the end while keeping the relative order of the non-zero elements. Return a new list with the result. Return null for null input and an empty list for empty input.
Examples:
Input: nums = [0, 1, 0, 3, 12]
Output: [1, 3, 12, 0, 0]
Explanation: Non-zero elements keep their order, zeroes move to the end
Input: nums = [0, 0, 1]
Output: [1, 0, 0]
Explanation: The single non-zero element moves to the front, zeroes follow
Input: nums = [1, 2, 3]
Output: [1, 2, 3]
Explanation: No zeroes present, list is unchanged
Input: nums = null
Output: null
Explanation: Null input returns null
Input: nums = []
Output: []
Explanation: Empty list returns empty list
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