Spring Improve ObjectUtils#nullSafeEquals method for readability and performance

Description:

This pull request simplifies the nullSafeEquals method to improve readability and performance.

Changes:

Reorganized if conditions for clarity and reduced redundancy. Optimized the array comparison logic for early termination when possible. Removed unnecessary equals checks, making the flow more efficient.

Comment From: bclozel

Thanks for the proposal, but I don't think this will improve performance as advertized, quite the opposite. This skips the equals check in favor of array class checks.