Given two date ranges defined by their start and end dates (inclusive), determine whether the ranges overlap. Two ranges overlap if there is at least one date that falls within both ranges. Ranges that share only an endpoint (e.g., one ends on the same day the other begins) are considered overlapping. Return false if any of the four date parameters is null.
Examples:
Input: start1 = 2026-01-01, end1 = 2026-01-15, start2 = 2026-01-10, end2 = 2026-01-25
Output: true
Explanation: The ranges share the dates January 10 through January 15
Input: start1 = 2026-01-01, end1 = 2026-01-10, start2 = 2026-02-01, end2 = 2026-02-10
Output: false
Explanation: The ranges do not share any dates
Input: start1 = 2026-01-01, end1 = 2026-01-15, start2 = 2026-01-15, end2 = 2026-01-30
Output: true
Explanation: The ranges share the single endpoint January 15
Input: start1 = null, end1 = 2026-01-15, start2 = 2026-01-10, end2 = 2026-01-25
Output: false
Explanation: Null date parameter returns false
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