Given a date, return the fiscal quarter number (1-4) based on calendar quarters. Q1 is January-March, Q2 is April-June, Q3 is July-September, Q4 is October-December. Return null if the input date is null.
Examples:
Input: inputDate = Date.newInstance(2025, 2, 15)
Output: 1
Explanation: February is in Q1 (January-March)
Input: inputDate = Date.newInstance(2025, 7, 1)
Output: 3
Explanation: July is in Q3 (July-September)
Input: inputDate = Date.newInstance(2025, 12, 31)
Output: 4
Explanation: December is in Q4 (October-December)
Input: inputDate = null
Output: null
Explanation: Null input returns null
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