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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