Calculate a new date by adding a specified number of days to a given date. Handle both positive and negative day values.

Examples:

Input: startDate = 2023-01-15, daysToAdd = 5 Output: 2023-01-20 Explanation: Adding 5 days to January 15, 2023 results in January 20, 2023 Input: startDate = 2023-01-15, daysToAdd = -5 Output: 2023-01-10 Explanation: Subtracting 5 days from January 15, 2023 results in January 10, 2023

Hints:

  1. Salesforce Date class has built-in methods for date calculations
  2. Consider how to handle date transitions across month and year boundaries
  3. Remember to handle null inputs appropriately
  4. Test with leap year scenarios to ensure correct behavior
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