Return the full English month name (for example, January) for the given date. Return null for null input.
Examples:
Input: d = Date.newInstance(2026, 1, 15)
Output: 'January'
Explanation: Month 1 maps to January
Input: d = Date.newInstance(2026, 7, 4)
Output: 'July'
Explanation: Month 7 maps to July
Input: d = Date.newInstance(2026, 12, 25)
Output: 'December'
Explanation: Month 12 maps to December
Input: d = null
Output: null
Explanation: Null input returns null
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