Given a date, return the week of the month it falls in, using a 1-indexed scheme where days 1 through 7 are week 1, days 8 through 14 are week 2, days 15 through 21 are week 3, and so on. Return 0 if the input date is null.
Examples:
Input: inputDate = Date.newInstance(2026, 9, 14)
Output: 2
Explanation: Day 14 falls in days 8-14, which is week 2
Input: inputDate = Date.newInstance(2026, 9, 1)
Output: 1
Explanation: Day 1 falls in days 1-7, which is week 1
Input: inputDate = Date.newInstance(2026, 9, 7)
Output: 1
Explanation: Day 7 is the last day of week 1
Input: inputDate = Date.newInstance(2026, 9, 8)
Output: 2
Explanation: Day 8 is the first day of week 2
Input: inputDate = Date.newInstance(2026, 9, 30)
Output: 5
Explanation: Day 30 falls in days 29-35, which is week 5
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