Compute the number of days between two dates. Return null if either input is null. Use absolute difference.
Examples:
Input: date1 = Date.newInstance(2024, 1, 1), date2 = Date.newInstance(2024, 1, 10)
Output: 9
Explanation: There are 9 days between January 1st and January 10th, 2024
Input: date1 = Date.newInstance(2024, 12, 25), date2 = Date.newInstance(2024, 12, 31)
Output: 6
Explanation: There are 6 days between December 25th and December 31st, 2024
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